From seed to cup

Everything You Need to Know About Coffee

Coffee can be simple—a familiar drink that starts the working day—or an intricate combination of plant species, origin, processing, roasting, grinding, water and brewing. This complete coffee guide explains the journey from the coffee plant to the finished cup and answers the questions people ask most often.

Caffia Coffee Group has supplied coffee, commercial coffee machines, installation, training and ongoing support to UK businesses for more than 30 years. We have created this guide to make coffee easier to understand, whether you are choosing beans for home, planning a café menu or improving the coffee served in your workplace.

What Is Coffee?

Coffee is a drink prepared by extracting soluble flavour and aroma compounds from roasted and ground coffee seeds using water. We commonly call them coffee “beans”, but botanically they are the seeds found inside the fruit of a coffee plant.

The fruit is often called a coffee cherry because of its shape and colour when ripe. Most cherries contain two seeds positioned flat sides together. A small proportion contain one rounded seed, known as a peaberry.

Coffee quality is influenced at every stage: plant species, variety, soil, altitude, climate, picking, processing, storage, roasting, grinding, water and the final brewing method.

Where Does Coffee Come From?

Coffee grows in tropical and subtropical regions commonly described as the “Coffee Belt”, broadly located between the Tropics of Cancer and Capricorn. Major producing countries include Brazil, Vietnam, Colombia, Ethiopia, Honduras, Uganda, India, Indonesia and Peru.

Arabica coffee originates from the forests of Ethiopia and South Sudan. Different producing countries—and even individual farms within the same country—can create noticeably different coffees because of their climate, elevation, soil, plant varieties and processing methods.

African coffee

Coffees from Ethiopia and Kenya are often associated with distinctive fruit, floral and bright flavour characteristics, although flavour varies between regions and lots.

Central and South America

Brazil, Colombia, Honduras, Peru and neighbouring origins produce an enormous range, including balanced, sweet, nutty, chocolate-led and fruit-forward coffees.

Asian coffee

Vietnam is particularly important for Robusta production, while Indonesia and India produce Arabica, Robusta and regionally distinctive coffee styles.

A Short History of Coffee

Coffee’s botanical roots are in Africa, particularly Ethiopia. Coffee cultivation and drinking later became closely associated with Yemen, from where the trade expanded through the Middle East and beyond.

Coffeehouses became important social and commercial meeting places. As international demand grew, cultivation spread across Asia, the Caribbean and Central and South America. Coffee is now one of the world’s most widely traded agricultural products and supports millions of farming households.

Many colourful stories surround coffee’s discovery, including the famous tale of an Ethiopian goat herder named Kaldi. It is better understood as a legend than a verified historical record.

Arabica vs Robusta Coffee

Although scientists recognise numerous species within the Coffea genus, most of the coffee consumed worldwide comes from two: Arabica and Robusta, the common name used for Coffea canephora.

Characteristic Arabica Robusta
Typical flavour Sweeter, more aromatic and often more complex Stronger, earthier and more bitter
Caffeine Generally lower Generally higher
Growing conditions Often associated with cooler, higher locations More tolerant of warmer, lower conditions
Common uses Speciality, single-origin and premium blends Espresso blends, instant coffee and added body

Neither species guarantees good or bad coffee. Quality also depends on growing, harvesting, processing, roasting and preparation. A carefully produced Robusta can outperform a poorly handled Arabica.

How Is Coffee Processed?

After picking, the seeds must be separated from the surrounding fruit and dried to a stable condition. Processing has a significant influence on flavour.

Washed process

The fruit is removed before the seeds are fully dried. Washed coffees are often associated with clarity, brightness and a cleaner expression of the coffee’s origin.

Natural process

The whole cherry is dried before the seeds are removed. Natural coffees can develop fuller, sweeter and more pronounced fruit characteristics.

Honey process

The skin is removed while some sticky fruit material remains during drying. Results vary but can combine sweetness and body with good flavour clarity.

What Do Coffee Roast Levels Mean?

Green coffee is roasted to develop the aromas, flavours and colour we associate with coffee. “Light”, “medium” and “dark” are broad descriptions rather than universal standards, so two roasters may use the terms differently.

Light roast coffee

Light roasts commonly preserve more origin character and may taste floral, fruity, bright or tea-like. They are often chosen for filter brewing and modern speciality coffee.

Medium roast coffee

Medium roasts often balance origin flavour with sweetness, body and roast development. They can work well across espresso, bean-to-cup and filter methods.

Dark roast coffee

Dark roasting creates more pronounced roast-led flavours such as dark chocolate, caramelised notes, spice or smokiness. It does not automatically mean the drink contains more caffeine.

Does dark roast have more caffeine?

Not necessarily. Caffeine content varies with bean species, the amount of coffee used, grind, extraction and serving size. Roast level alone is not a reliable way to predict how much caffeine will be in the finished drink.

Why Does Coffee Have Different Flavours?

Coffee can naturally suggest flavours such as chocolate, nuts, caramel, berries, citrus, stone fruit, flowers and spices. These tasting notes do not usually mean that flavourings have been added. They describe aromas and sensations people recognise in the coffee.

Flavour is influenced by:

  • Coffee species and plant variety
  • Country, region, farm and growing altitude
  • Climate, soil and ripeness when picked
  • Washed, natural, honey or other processing methods
  • Roast development
  • Freshness and storage
  • Grind size, water and brewing technique

Acidity in coffee does not simply mean sourness. In a balanced cup, acidity can create freshness and remind the drinker of apple, berries or citrus. Sour coffee normally indicates imbalance or under-extraction rather than desirable acidity.

Which Coffee Grind Size Should You Use?

Grind size controls how quickly water extracts flavour. Fine particles expose more surface area and extract more quickly; coarse particles extract more slowly.

Brewing method Starting grind Typical appearance
Traditional espresso machine Fine Finer than table salt
Moka pot Fine to medium-fine Slightly coarser than espresso
Filter or pour-over Medium Similar to granulated sugar
Cafetière Coarse Distinct, larger particles
Cold brew Coarse Coarse and even

These are starting points. If coffee tastes sour, weak and underdeveloped, try grinding slightly finer. If it tastes harsh, dry or bitter, try grinding slightly coarser.

Popular Coffee Brewing Methods

Espresso

Espresso uses pressure to pass water through finely ground coffee, producing a small, concentrated drink that also forms the base of cappuccino, latte and flat white.

Bean-to-cup

A bean-to-cup machine grinds, doses and prepares the drink automatically. Commercial models are popular where speed, consistency and self-service operation matter.

Filter and pour-over

Water passes through ground coffee and a filter. This method can produce a clean cup and is practical when several servings are needed.

Cafetière

Coarsely ground coffee steeps in water before a mesh plunger separates the grounds. The result generally has a fuller body because no paper filter removes the coffee oils.

Moka pot

A stovetop moka pot uses steam pressure to move water through coffee. It produces a concentrated drink but does not operate at the same pressure as a commercial espresso machine.

Cold brew

Coffee is steeped in cool water for an extended period and then filtered. Cold brew should not be confused with iced coffee, which may simply be hot-brewed coffee served over ice.

Common Coffee Drinks Explained

Drink What it contains
Espresso A small, concentrated extraction of coffee
Americano Espresso combined with hot water
Long black Hot water with espresso added, often retaining more crema
Cappuccino Espresso with steamed milk and a pronounced foam layer
Latte Espresso with a larger proportion of steamed milk
Flat white Espresso with textured milk, normally smaller and more coffee-led than a latte
Macchiato Espresso marked with a small amount of milk or foam
Mocha Espresso, chocolate and milk
Cortado Espresso balanced with a relatively small amount of warm milk

Recipes and cup sizes vary between cafés, countries and machines. A clear house recipe is important for consistency.

How Much Caffeine Is in Coffee?

There is no single caffeine figure for “a cup of coffee”. The amount depends on the coffee species, dose, grind, brewing method, extraction and serving size. Robusta generally contains more caffeine than Arabica.

Espresso is more concentrated per millilitre, but it is served in a much smaller quantity. A large filter coffee can therefore contain more total caffeine than a single espresso.

Health note

Individual responses to caffeine vary. People who are pregnant are advised by the NHS not to consume more than 200mg of caffeine per day. Anyone with a medical condition, medication concern or unusual reaction to caffeine should seek advice from an appropriate healthcare professional.

What Is Decaffeinated Coffee?

Decaf coffee is produced from coffee beans that have had most of their caffeine removed before roasting. It is not necessarily completely caffeine-free, but it contains substantially less caffeine than standard coffee.

Different processes use water, carbon dioxide or approved solvents to extract caffeine from green coffee. Terms such as “water processed” refer to the type of decaffeination method rather than a different coffee species.

Good decaf should still taste like carefully selected and roasted coffee. Freshness, grind and preparation remain important.

How Should Coffee Be Stored?

Coffee loses aroma through exposure to oxygen, heat, light and moisture. Store it in a cool, dry place inside a properly sealed, food-safe container.

  • Keep coffee away from direct sunlight and heat.
  • Reseal the bag or container immediately after use.
  • Avoid storing coffee beside strongly scented products.
  • Buy quantities that can be used while reasonably fresh.
  • Grind whole beans close to brewing whenever practical.
  • Do not allow moisture to enter the container.

Refrigeration is usually unnecessary for coffee in everyday use and can expose it to moisture and odours. Long-term freezing can work when coffee is divided into airtight portions and allowed to reach room temperature before opening.

Choosing Coffee for an Office, Café or Business

The best coffee for a business depends on its customers, equipment and service style. A café with trained baristas may choose a distinctive espresso blend or rotating single origins. A busy workplace may prioritise a balanced, broadly appealing coffee that performs consistently in a bean-to-cup machine.

Consider:

  • The number of drinks served daily
  • Whether the coffee will be used for espresso, filter or bean-to-cup
  • The proportion of black and milk-based drinks
  • Customer flavour preferences
  • Freshness and delivery frequency
  • Fairtrade, organic or Rainforest Alliance requirements
  • Staff training and machine cleaning
  • Cost per cup rather than bag price alone

Bean-to-cup machines

Grind whole beans and prepare drinks automatically. They are well suited to workplaces and self-service environments.

View bean-to-cup machines

Traditional espresso machines

Give trained baristas greater control over grinding, extraction and milk preparation. They are widely used in cafés and hospitality.

View commercial espresso machines

Complete commercial range

Compare automatic, traditional, filter and other professional coffee solutions for different business environments.

View commercial coffee machines

What Does Sustainable Coffee Mean?

Coffee sustainability covers environmental, social and economic considerations throughout the supply chain. These include farmer livelihoods, working conditions, climate resilience, biodiversity, traceability, transport, packaging and waste.

Fairtrade

Fairtrade standards and pricing mechanisms are intended to support fairer trading conditions and provide certified producer organisations with additional resources through the Fairtrade Premium.

Rainforest Alliance

Rainforest Alliance certification relates to environmental, social and farm-management requirements within agricultural supply chains.

Organic certification

Certified organic coffee must comply with applicable organic production and handling standards. “Organic” should not be used merely as an informal description.

Certification is useful, but no single label answers every sustainability question. Businesses should also consider transparency, supplier practices, equipment efficiency, responsible portioning and reducing avoidable waste.

Why Does My Coffee Taste Wrong?

Sour coffee

Often associated with under-extraction. Try a finer grind, longer contact time, a suitable water temperature or checking that enough coffee is being extracted.

Bitter or dry coffee

May indicate over-extraction, coffee ground too finely, an excessively long brew or equipment that needs cleaning.

Weak coffee

Check the coffee-to-water ratio, grind setting, freshness and extraction. Adding more coffee may help, but the underlying brewing problem should also be corrected.

Burnt flavour

This may come from a dark roast, excessive heat, old residues, poorly maintained equipment or coffee left on heat for too long.

Flat or stale coffee

Coffee may have been exposed to air for too long, ground too far in advance or stored in unsuitable conditions.

Inconsistent coffee

Check dose, grind, water, preparation technique, machine settings and cleaning. Consistent processes produce consistent drinks.

Frequently Asked Questions About Coffee

Is coffee a bean?

It is commonly called a bean because of its appearance, but it is actually the seed found inside the fruit of a coffee plant.

What is the best coffee?

There is no universal best coffee. The right choice depends on preferred flavour, brewing method, freshness and how the coffee will be served. Quality and suitability matter more than a single origin or roast being declared “best”.

What are the main types of coffee bean?

Arabica and Robusta are the two principal commercially consumed species. Liberica and other coffee species are produced in much smaller quantities.

What is speciality coffee?

Speciality coffee is associated with careful production, evaluation and preparation across the supply chain. The term is increasingly understood through a broader assessment of a coffee’s attributes and value rather than one simplistic claim.

Is espresso a type of coffee bean?

No. Espresso is a brewing method. Coffee labelled “espresso” has usually been selected or roasted to perform well when prepared using an espresso machine.

Does stronger-tasting coffee contain more caffeine?

Not necessarily. Strong flavour, roast darkness and caffeine content are different things. Caffeine depends on species, dose, extraction and serving size.

Does coffee dehydrate you?

Coffee contributes fluid as well as caffeine. UK government healthy-eating guidance states that sugar-free drinks, including tea and coffee, can contribute to normal fluid intake.

Does coffee expire?

Packaged coffee carries storage and date information, but flavour and aroma can decline significantly before coffee becomes unsafe. Store it correctly and follow the information on the packaging.

Should coffee beans be kept in the fridge?

Usually not for everyday use. Refrigerators can introduce moisture and odours. A sealed container in a cool, dry cupboard is normally more practical.

Can coffee beans be frozen?

Yes, particularly for longer storage, provided they are divided into airtight portions. Allow a portion to reach room temperature before opening it to reduce condensation.

How much coffee should I use?

The correct amount depends on the brewing method and preferred strength. Weighing coffee and water provides more consistent results than relying only on scoops.

Can you use espresso beans for filter coffee?

Yes. “Espresso bean” usually describes intended use or roast style, not a separate species. Adjust the grind for the filter method and decide whether you enjoy the resulting flavour.

Can you use ground coffee in a bean-to-cup machine?

Some machines have a bypass chute for a limited amount of pre-ground coffee, while others are intended only for whole beans. Follow the instructions for the specific model.

What is the difference between iced coffee and cold brew?

Iced coffee is often brewed hot and served chilled or over ice. Cold brew is extracted using cool water over a much longer period.

Why is freshly ground coffee better?

Grinding greatly increases the surface area exposed to oxygen. Aromatic compounds can dissipate more quickly, so grinding near the time of brewing generally preserves more aroma.

What water should be used for coffee?

Use fresh, drinkable water without strong odours or flavours. Mineral content affects extraction and can also cause scale, so commercial equipment may require appropriate water treatment.

Why does coffee machine cleaning matter?

Coffee oils, milk residues and scale can affect taste, reliability and hygiene. Follow the manufacturer’s daily and periodic cleaning requirements using approved products.

What coffee is best for a bean-to-cup machine?

Choose fresh whole beans with a flavour profile suited to the audience. Extremely oily beans can be unsuitable for some grinders, so follow the machine manufacturer’s recommendations.

What coffee is best for an office?

A balanced, approachable coffee that works well both black and with milk is usually a strong starting point. The final choice should be tested in the office’s actual machine.

How can a business improve its coffee?

Match the beans to the equipment, use suitable water, keep the machine and grinder clean, train users, adjust recipes and arrange preventative servicing. Better equipment alone cannot compensate for poor cleaning or unsuitable ingredients.

Looking for Better Coffee at Work?

Caffia supplies commercial coffee machines, freshly roasted coffee, installation, training and ongoing support to businesses throughout the UK. Tell us about your workplace or venue and we will help you create the right coffee solution.

Speak to a Caffia Coffee Specialist