Drain the cherries. Grease an ovenproof dish (approx. 1.8 l capacity) and sprinkle with breadcrumbs. Preheat the oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer).
Separate eggs. Beat the egg whites with the whisks of the mixer until stiff. Mix 60 g butter, 125 g sugar, vanilla sugar, 1 pinch of salt, almond flavour and egg yolk. Mix flour, baking powder, wheat and corn semolina.
1⁄4 Add l milk and flour mixture to the egg yolk mixture and stir in. First fold in the beaten egg white, then the cherries. Pour the semolina mixture into the mould. Bake in a hot oven for approx. 1 1⁄4 hours.
In the meantime, take 8 tablespoons of milk from 1⁄2 l milk. Stir with 5 tablespoons sugar and sauce powder until smooth. Boil up the rest of the milk. Stir the sauce powder into the boiling milk, bring to the boil and simmer for about 1 minute.
Remove from the heat and let it cool down while stirring occasionally. Serve the vanilla sauce with the casserole.