Don't expect this casserole to be super fluffy and not fall off. Expect it to be delicious!
Preheat oven to 160°C. Soak raisins in warm water for 15-20 minutes. Then drain in a colander and pat dry.
Mix semolina, flour, starch, baking powder and salt. Beat eggs, yolks, sugar and sour cream until smooth.
Continuing to beat (preferably with an immersion blender, but you can also use a mixer), add a little cottage cheese. When all the cottage cheese is added, pour in the dry mixture and mix thoroughly. Let the mass stand for 20 minutes.
Peel the apples from the peel and core, cut into slices and sprinkle them with lemon juice. Add the lemon zest and raisins to the batter and mix.
Generously grease a deep form with oil, sprinkle with a little semolina. Lay the apples on the bottom of the mold. Gently spread the dough over them. Put the casserole in the oven for 45-60 minutes. A wooden skewer inserted into the center of the finished casserole should come out dry.
Cool the casserole on a wire rack, 15 minutes. Carefully invert the casserole onto a platter. Serve with sour cream or jam, warm or cold.