Wash, peel and quarter the apples and remove the cores. Cut the quarters into pieces. Bring lemon juice, 100 ml water, 75 g sugar and apple pieces to the boil, simmer over a low heat for about 15 minutes and allow to cool.
Knead 300 g flour, 150 g sugar, 1 packet vanilla sugar, almonds and 175 g soft fat with the dough hooks of the hand mixer, then knead again with your hands to form crumbles. Beat the remaining fat, vanillin sugar and sugar with the whisk of the hand mixer until foamy.
Add the eggs one by one. Stir in sour cream. Mix remaining flour and baking powder and stir in. Put the dough on a greased baking tray (34 x 39 cm) and spread. Spread apple compote evenly on the dough, add crumbles and bake in a preheated oven (electric range: 200 °C / gas: level 3) for 35-40 minutes.