Wash the lemon thoroughly and cut off half of the peel thinly. Squeeze 1/2 lemon. Boil 250 ml water, wine, 50 g sugar, cinnamon, lemon juice and zest in a pot. Peel quinces, quarter them, cut out the core and cut the quarters into slices.
Steam in the wine stock for about 5 minutes. Drain and let it cool down. Peel, quarter, core and slice the pears. For the dough, mix fat, 100 g sugar and vanilla sugar until foamy.
Stir in 2 eggs. Grate remaining lemon peel. Mix flour, cornstarch, baking powder and lemon peel and stir into the fat mass. Pour into a greased springform pan (28 cm Ø) sprinkled with breadcrumbs and smooth it down.
Pre-bake in the preheated oven (electric: 200 ° C / gas: level 3) for 8-10 minutes. (The dough should only become so firm that the fruits do not sink in) In the meantime, mix sour cream, remaining eggs and sugar.
Place the fruits in alternate layers on the cake and pour the custard mixture over them. Bake at the same temperature for 35-40 minutes. Heat up quince jelly as desired and spread a thin layer on the still hot cake.
Results in about 16 pieces.