Brühverdünnung

Brühverdünnung refers to the dilution of a concentrated coffee brew, typically an espresso or a ristretto, with hot water. This process is fundamental to creating popular coffee beverages such as the Americano. The purpose of brühverdünnung is to alter the strength and flavor profile of the original concentrated coffee by reducing its intensity and bitterness.

The ratio of coffee concentrate to water can vary significantly, leading to different taste experiences. A common method for preparing an Americano involves pouring hot water into a cup first, followed by the espresso. This technique is believed by some to help preserve the crema, the reddish-brown foam on top of espresso, by gently mixing with the coffee rather than disrupting it. Alternatively, the espresso can be brewed directly into the hot water.

The term "Brühverdünnung" itself is German, translating directly to "brew dilution." It emphasizes the controlled reduction of coffee strength through the addition of water to a pre-brewed, concentrated coffee base. This method differs from simply brewing coffee with a larger volume of water, as it starts with a highly concentrated extraction, which can influence the extraction of soluble solids and the resulting aroma and mouthfeel. The control over the dilution ratio allows baristas and home brewers to customize the beverage to individual preferences.