A shot glass of vodka goes down into a glass of lager and rests on the bottom like a small submarine. As you drink, the beer and vodka slowly mix and the little glass surfaces.
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Pour the cold lager into a large beer glass, leaving room at the top.
Fill a small, heavy shot glass with vodka.
Lower the shot glass carefully into the beer with your fingers or tilt it in, rather than dropping it from a height.
Serve at once and drink at a relaxed pace.
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U-Boot (Beer and Vodka Drop)
Taste
Crisp, malty beer with a clean alcoholic warmth that grows toward the bottom of the glass as the vodka mixes in.
History and origin
U-Boot is German for submarine, and the name describes exactly how the drink is served: a filled shot glass is lowered into a larger glass of beer so that it sits on the bottom. Similar drop drinks exist in many countries, from the American boilermaker, where a shot of whiskey is dropped into beer, to the Korean somaek of soju and beer and the Russian yorsh of beer and vodka.
The U-Boot is not a bartender's creation with a known history but a pub and party serve, and there is no documented inventor. What unites all these drinks is that they combine a beer with a spirit in one glass, which makes them considerably stronger than beer alone, so they are best taken slowly rather than downed in one.
Bartender tips
Use a sturdy shot glass and never drop it from high up: a glass hitting glass can chip or break.
A light, crisp lager or pilsner works best; dark or strongly hopped beers clash with the vodka.
Keep the vodka at a single 20 ml measure; the drink is already clearly stronger than a normal beer.