Melt the butter in a frying pan. Cut the bread into cubes and toast them in the butter.
Put the cinnamon stick, beer, raisins and sugar in a saucepan and bring to the boil briefly. Season with salt, pepper and a pinch of nutmeg.
Mix egg yolk and whipping cream and thicken the soup with it. Do not make more.
Pour the soup into warmed soup plates, sprinkle with bread cubes and garnish with parsley.
Serve with fresh baguette and, of course, fresh Pilsner.