Sprinkle 350 g raspberries in a pot with 80 g sugar, defrost.
Preheat oven for the floor (electric oven: 200 °C/circulating air: 175 °C/gas: see manufacturer). Cream 140 g soft butter, 80 g sugar and 1 pinch of salt with the whisks of the mixer. Mix 40 g starch, 180 g flour and baking powder.
Knead briefly with floured hands. Line an angular springform pan (24 x 24 cm; alternatively round, 26 cm Ø) with baking paper. Press the dough with your hands to a base. Bake in a hot oven for 15-18 minutes until golden brown.
For the crumbles, knead 100 g soft butter, 100 g sugar, 1 pinch of salt, 125 g flour and grated coconut into coarse crumbles.
Heat sugared berries for the filling. Mix 25 g starch with 4 tablespoons of water until smooth, stir into the hot berries. Simmer for about 2 minutes while stirring. Remove from heat. Fold in the rest of the frozen berries.
Spread the filling over the pre-baked base. Spread crumbles on top. Bake in a hot oven at the same temperature for about 30 minutes.
Remove from the oven and let it cool down. Carefully remove from the mould. Dust with icing sugar and cut into pieces.