Defrost the berries. Cream fat, salt and 175 g sugar. Stir in eggs one at a time. Mix flour and baking powder and stir in. Finally stir in lemon juice. Halve the dough. Stir ground almonds into one half
Roughly mash the blueberries, some whole blueberries should still be visible. Stir the blueberry puree into the other half of the dough. First put the light-coloured dough into a greased and floured square springform pan (24 x 24 cm), then fill in the blue-violet dough. Marble the doughs with a fork and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 35-45 minutes (stick test)
Roast almond kernels in a pan without fat. Add 40 g sugar and let it caramelize. Put almonds on a piece of baking paper and let them cool down. Take the cake out of the oven, remove from the edge of the tin and let it cool down on a cake rack
Roughly chop the almonds. Cut the cake into 8 strips, then halve lengthwise. Before serving, decorate with icing sugar and caramelised nuts
waiting time approx. 1 1/4 hours