Separate egg, chill egg white. Put flour, butter in flakes, salt, 50 g sugar and egg yolk in a bowl. Knead first with the dough hooks of the hand mixer, then with your hands to a smooth shortcrust pastry. Wrap the dough in foil and chill for about 30 minutes
Select the berries, wash and drain well. Wash the lemon and grate dry. Grate half of the lemon peel, halve the lemon and squeeze 1 half. Stir jelly with the starch until smooth. Stir in blueberries, blackberries, lemon juice and zest
Roll out the dough thinly on a floured work surface. Cut out 4 circles (each approx. 12 cm Ø), knead the dough and roll out. Grease 4 tartlet moulds with lift-off base (each approx. 10 cm Ø), dust with flour and line with dough circles. Add the berry filling and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 20 minutes.
In the meantime, beat the egg whites with the whisks of the hand mixer until stiff. Slowly pour in 50 g sugar. Fold the grated coconut into the beaten egg white. Pour the macaroon mixture into a piping bag with a medium perforated spout. Pour a macaroon tuff in the middle of each of the still hot tartlets. Bake in the preheated oven (electric cooker: 150 °C/ convection oven: 125 °C/ gas: see manufacturer) for approx. 10 minutes, remove from oven and let cool off. Carefully remove the tartelettes from the tartlets
Waiting time approx. 50 minutes