For the dough, briefly knead 50 g icing sugar, lemon zest, 175 g flour, 100 g butter in pieces and 1-2 tbsp. cold water with your hands to a smooth dough. Shape into a flat ball. Cover and chill for about 1 hour.
Grease the springform pan (20 cm Ø).
Finely grind 50 g almonds in the universal chopper or with a hand blender. Wash, halve and stone the apricots. Sort the raspberries, wash if necessary, drain. Roll out the dough on a little flour until round (approx. 26 cm Ø).
Line the mould with the dough. Sprinkle ground almonds on the bottom. Preheat the oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer).
Mix apricots, starch and sugar. Carefully fold in the berries. Fill into the mould like a dome. Fold the protruding dough from the edge inwards over the filling. Sprinkle the rest of the chopped almonds over it.
Bake in a hot oven for 30-40 minutes. Remove and let cool on a cake rack. Carefully remove from the mould. Serve lukewarm or cold. Dust with a little icing sugar as desired.