Heat the contents of a bottle of beer and mix with a cup of water. Add to the hot beer a little sugar form and season with a pinch of salt. Thicken the beer broth with a tablespoon of flour, stirred a little before adding.
Finally, thicken the soup with an egg yolk, which is first mixed in a cup of fat milk.
Toast white bread cubes in butter until crisp and pour over the beer soup form.