ESPRESSO is a highly concentrated coffee drink, the basis of a litany of beverages found in cafés all around the world. Some people mispronounce it “ex-presso”—an almost intuitive mistake considering the quick process to make the drink.

Making espresso requires a dedicated espresso machine, most of which consist of a chassis with a boiler. Once the water gets hot enough, a pump allows it to flow into a metal device called a head or group, which contains packed grounds. The pressure from the machine then forces the water through the grounds, extracting the precious coffee oils in seconds. The liquid coffee excretes through a bottom spout in the head.

Normally, espresso is served in one- or two-ounce (30 or 60 ml) amounts depending on ...

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