Mix fat, 200 g sugar, 1 egg, flour, almonds, baking powder, lemon peel, salt and cinnamon with the dough hooks of the hand mixer to a crumbly dough. Spread about 3/4 of the dough on the bottom of a springform pan (26 cm Ø) lined with baking paper and press it smooth.
Mix the sour cream with the remaining eggs, sugar, lemon juice and starch until smooth. Fold in about 2/3 of the blueberries. Pour the mixture onto the base. Spread the remaining crumbles with the remaining blueberries on top and bake in a preheated oven (electric range: 175 °C/ gas: level 2) on the 2nd rung of the cake.
Bake from the bottom for 60-70 minutes. Dust with icing sugar before serving. Results in about 16 pieces.