Ingredients: 100g (less than a stick) butter, 100g (bit more than 1/2cup) farina/semolina (Grieß), 500g (bit more than a pound) Quark (or Yogurt Cheese), 150g (less than 3/4cup) sugar, 3 eggs, 1 pack vanilla sugar (or 1 tsp vanilla extract), 400g (about 3-4) apples, 1 tablespoon lemon juice, 1 tablespoon breadcrumbs (Semmelbrösel).
Separate egg yolks from egg whites. Bring half of the butter to room temperature and beat together with the sugar (with a mixer) until foamy. Add farina, quark, egg yolk and vanilla.
Wash and peel apples, remove cores. Cut in small slices, add immediately to the quark mix. Add lemon juice. Beat egg whites to stiff peaks and add carefully until fully incorporated. Fill the mixture into a greased oven-proof dish. Distribute breadcrumbs and the rest of the butter in small pieces on the top. Bake at 200C (400F) for 35-40mins until golden yellow. Eat warm, as a main course or for dessert.