Wash the plums, remove the stalks, halve and stone them. Boil up the plums, 1/8 l water, 3 tbsp sugar and cinnamon stick. Simmer for 2-3 minutes. Stir starch and 2 tbsp. water until smooth. Stir into the plums, simmer for 2 minutes.
Let it cool down. Remove the cinnamon stick.
Separate eggs. Whisk the egg yolks, 50 g sugar, milk and 1 pinch of salt in a large bowl. Gradually add flour and sauce powder. Beat the egg whites in a large bowl or in two portions until stiff, as the volume increases greatly when beaten.
Fold the beaten egg white into the dough.
Heat 1 tablespoon of butter in a large frying pan. Pour in about 1/4 of the dough. The dough should be about 2 cm high and bake the bottom side at low heat for 2-3 minutes until golden brown. Then quarter it with a spatula, turn it over and bake it from the other side for 1-2 minutes until golden.
Tear into pieces with two forks and bake for 1-2 minutes while turning. Place the finished slices in a hot oven at 50 °C. From the remaining dough bake 3 more slices. Dust with icing sugar, add compote.