Melt 20 g butter. Mix 75 g flour, 1 tablespoon sugar, salt and 2 eggs. Stir in 100 ml milk. Gradually stir in the butter. Let the dough swell for about 20 minutes. Grease a pan (approx. 15 cm Ø) with oil in portions.
Put about 1/8 of the dough into the pan. Bake one side until golden brown, turn the crêpe over and finish baking. Remove from the pan and allow to cool. Also bake about 7 more crêpes.
In the meantime cut the vanilla pod lengthwise and scrape out the pulp. Heat 250 ml milk, 50 g sugar, vanilla pod and pulp. Remove the pot from the stove. Separate 2 eggs. Cover the egg whites and put them in a cool place. Stir egg yolks and 35 g flour into the vanilla milk.
Boil down over medium heat while stirring for about 2 minutes until thick. Pour into a larger bowl, remove vanilla pod. Place the foil directly on the cream, let it cool down.
In the meantime peel, quarter and core the apples. Cut apples into slices. Melt 50 g butter in a pan. Fry the apples in it while turning them golden brown. Sprinkle with cane sugar and caramelise.
Add cream and let it boil down for about 2 minutes to a thick sauce. Remove from heat and keep warm.
Remove the foil from the vanilla cream. Separate 1 egg. Mix egg yolk and cognac, stir into the cream. Beat 3 egg whites with the whisks of the hand mixer until stiff, adding 10 g sugar.
Fold the beaten egg white into the cream. Spread approx. 1/8 of the cream on half of each crêpe, fold the second half of the crêpes over it. Place the crêpes on a baking tray lined with baking paper. In a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see
manufacturer) bake for about 10 minutes. Remove from the oven and arrange on plates or small platters. Pour a little apple compote on top, add the rest of the compote. Serve immediately.