Separate the eggs. Beat egg whites with a pinch of salt until stiff.
Beat egg yolks, sugar, flour and milk until creamy. Slowly stir this batter into the beaten egg whites.
Melt the butter in a pan, pour in the batter, let it brown slightly, turn it over and after a few minutes tear it into small pieces with a wooden spoon.
Serve the Kaiserschmarrn still warm.