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Coffee preparation

Process of turning coffee beans into a beverage

  • 28 min read
  • 7 chapters

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Through Boiling point, Vacuum flask and Boiling

Key variables in coffee preparation include grind size, water temperature, brew time, and the ratio of coffee to water, all of which influence extraction and flavour.

Coffee is usually brewed hot, at close to the boiling point of water, immediately before drinking; if not consumed promptly, coffee is often sealed into a vacuum flask or insulated bottle to maintain its temperature.

In most areas, coffee may be purchased unprocessed, or already roasted, or already roasted and ground. Whole roast coffee or ground coffee is often vacuum-packed to prevent oxidation and lengthen its shelf life. Especially in hot climates, some find cold or iced coffee more refreshing. This can be prepared well in advance as it maintains its character when stored cold better than as a hot beverage.

Even with the same roast, the character of the extraction is highly dependent on distribution of particle sizes produced by the grinding process, temperature of the grounds after grinding, freshness of the roast and grind, brewing process and equipment, temperature of the water, character of the water itself, contact time with hot water (less sensitive with cold water), and the brew ratio employed. Preferred brew ratios of water to coffee often fall into the range of 15–18:1 by mass; even within this fairly small range, differences are easily perceived by an experienced coffee drinker. Processes can range from extremely manual (e.g. hand grinding with manual pour-over in steady increments) to totally automated by a single appliance with a reservoir of roast beans which it automatically measures and grinds, and water, which it automatically heats and doses. Another common style of automated coffee maker is fed a single-serving "pod" of pre-measured coffee grounds for each beverage.

Characteristics which may be emphasised or deemphasised by different preparation methods include: acidity (brightness), aroma (especially more delicate floral and citrus notes), mouthfeel (body), astringency, bitterness (both positive and negative), and the duration and intensity of flavour perception in the mouth (finish). The addition of sweeteners, dairy products (e.g. milk or cream), or dairy alternatives (e.g. almond milk) also changes the perceived character of the brewed coffee. Principally, dairy products mute delicate aromas and thicken mouthfeel (particularly when frothed), while sweeteners mask astringency and bitterness.

Roasting

Roasting coffee transforms the chemical and physical properties of green coffee beans. When roasted, the green coffee bean expands to nearly double its original size, changing in colour and density. As the bean absorbs heat, its colour shifts to yellow, then to a light "cinnamon" brown, and then to a rich dark brown colour. During roasting, oils appear on the surface of the bean. The roast will continue to darken until it is removed from the heat source.

Coffee can be roasted with ordinary kitchen equipment (frying pan, grill, oven, popcorn popper) or by specialised appliances. A coffee roaster is a special pan or apparatus suitable to heat up and roast green coffee beans.

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