Knead 170 g flour, 60 g butter in flakes, 30 g sugar and 1 egg to a smooth shortcrust pastry. Wrap in foil and chill for about 30 minutes. Knead 80 g softened butter, 130 g flour and 70 g sugar into crumbles.
Peel, halve and core apples. Sprinkle with 2 tablespoons of lemon juice. Separate 2 eggs. Whisk the egg yolks and 100 g sugar with the whisk of the hand mixer for 5 minutes until creamy. Stir curd, sour cream, oil, pudding powder, 2 tablespoons lemon juice, lemon peel and poppy seed bake until smooth.
Stir in the egg yolk-sugar mixture. Beat the egg white until stiff and fold into the quark mixture. Grease a springform pan (26 cm Ø). Roll out short pastry in it. Sprinkle with almonds. Spread apple halves on it.
Spread the quark mixture on the apple layer. Spread the crumbles evenly over it. Bake in the preheated oven (electric oven: 175 °C/ convection oven: 150 °C/ gas: level 2) on the 2nd rack from below for approx. 75 minutes.
Remove from the oven and leave to rest in the mould for 5 minutes. Arrange the cake on a plate decorated with apple and mint. Serve with whipped cream and poppy seeds.