Put 200 g flour, icing sugar, starch, 1 pinch of salt and butter in a bowl. Knead first with the dough hook of the hand mixer, then quickly with your hands to a smooth dough. Wrap in foil and chill for about 30 minutes.
Line a square springform pan (approx. 24 x 24 cm) with baking parchment, roll out the dough on a floured work surface and put it into the springform pan. Bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see
manufacturer) for about 25 minutes.
Meanwhile, wash the lemons hot, grate them dry and grate the peel thinly. Halve the lemons and squeeze the juice (approx. 100 ml). Whisk the eggs in a bowl with whisks. Add milk, sugar, 3 tbsp. flour, 1 pinch of salt, 100 ml lemon juice and zest and stir in.
Take the dough out of the oven, add the lemon mixture and bake at the same temperature for 20-25 minutes. Take the cake out of the oven and let it cool down on a cake rack for about 2 hours.
Select the berries, wash and drain if necessary. Strip the currants from the panicles. Halve remaining berries. Cut the cake into approx. 6 x 6 cm pieces. Spread the berry mixture on top.
Sprinkle with coconut shavings.