Espresso is the primary source of coffee and caffeine in a latte, macchiato, and many other beverages.
Wikipedia[]
Espresso is coffee brewed by forcing a small amount of nearly boiling water under pressure through finely ground coffee beans. Espresso is generally thicker than coffee brewed by other methods, has a higher concentration of suspended and dissolved solids, and has crema on top (a foam with a creamy consistency). Espresso is the base for other drinks, such as a caffè latte, cappuccino, caffè macchiato, cafe mocha, or caffè Americano.
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