Warm 100 ml of milk slightly. Crumble the yeast and dissolve in the lukewarm milk. Let stand for about 10 minutes
Chill the egg whites. Heat 200 ml of milk and put it in a bowl. Add the egg yolks and beat until frothy with a hand mixer. Stir in flour, lemon zest, salt and yeast mixture. Cover and leave to rise in a warm place for about 45 minutes
Beat the egg white until stiff and fold into the dough. Grease the depressions of a frying pan. Heat the pan. Fill the dough up to the edge into the hollows and bake until light brown. Turn with a fork and bake from the other side until golden brown. While still warm, turn in sugar or dust with icing sugar. Serve with sugar beet syrup or blueberry compote