brew group

The brew group is the entire assembly that circulates the water to the coffee puck during the extraction. The brewing group includes only the components after the boiler. A brew group contains as a minimum the group head, and the portafilter, but sometimes has more components depending on the design, or the level of automation. Some brew groups are actively heated, some are passively heated by the boiler through contact. The entire brew group should be sufficiently heated in order to brew a proper espresso.

The most known brew group is FAEMA E61, designed in 1961 for semiautomatic espresso machines.… Read more


Ristretto Espresso Shot

Espresso shotRistretto is a short shot of espresso coffee made with the normal amount of ground coffee but extracted with about half the amount of water. Traditionally, a ristretto is extracted using the same amount of coffee grounds and water as a normale, but reducing the time to brew it. The result is a concentrated espresso with a different flavor and taste profile, and slightly lower caffeine content.

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Total dissolved solids

Total Dissolved Solids (often abbreviated TDS) is a measure of the combined content of all inorganic and organic substances contained in a liquid in: molecular, ionized or micro-granular suspended form. Generally the operational definition is that the solids must be small enough to survive filtration through a sieve the size of two micrometer. Total dissolved solids are normally discussed only for freshwater systems, as salinity comprises some of the ions constituting the definition of TDS.

TDS is an important measure in coffee brewing since it determines the coffee strength, and concentration.… Read more

coffee grind size

Coffee ground with a blade grinder

Coffee ground with a blade grinderWhat Is Coffee Grind Size?

Grind size is an important factor in coffee preparation, and it refers to the how fine or coarse the coffee bean is ground in order to prepare the coffee beverage.

What Is the Coffee Grind Size for the Major Brewing Methods?

In general, each coffee brewing method has its own grind size range, specific to the extraction parameters. For some methods, the grind size and consistency are very important, while for others not critical, but still important.

The universally accepted standards for grind size are the following:

  • Turkish Coffee, (Greek Coffee) – the finest grind, powder, (flour).
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Cappuccino Topped with Dry Milk Foam

Cappuccino Topped with Dry Milk FoamA cappuccino, is an Italian coffee drink traditionally prepared with espresso, hot milk, and steamed-milk foam. Istituto Nazionale Espresso Italiano defines cappuccino as a beverage prepared with 25 ml espresso, and 100 ml steam-foamed milk. In coffee shops in North America, cappuccino is prepared with a doppio espresso and frothed milk up to 6 fl oz.

The milk content is about two thirds of the total beverage volume. However, half of the milk is simply steamed milk, while the other half is foamed milk, which serves mostly as decoration. So in effect, the total content of milk is about the same as the content of coffee.… Read more