Beer Soup (Biersuppe) recipe.

Ingredients
6 cups beer
2 egg yolks
1 cup sour cream
1 teaspoon cornstarch
1 teaspoon white sugar
1/2 teaspoon salt
4 slices French bread, cut into 1 inch cubes
1 cup shredded Swiss cheese

Directions
In a medium saucepan over medium heat, bring beer, covered, to a boil.
Meanwhile, in a bowl, beat together egg yolks, sour cream, cornstarch, sugar and salt until well blended. Transfer mixture to a large saucepan over low heat. Pour in hot beer, a little at a time, stirring until well combined. Do not boil.
To serve, divide bread cubes into four warmed soup bowls. Sprinkle cheese over bread. Pour hot soup over all and serve piping hot.