Cut 70 g butter into pieces. Knead flour, butter, icing sugar and egg with your hands to a smooth dough. Wrap the dough in foil and chill for about 30 minutes.
Raspberries selected. Puree 375 g raspberries and pass through a sieve. Roll out the dough rectangularly (approx. 13 x 37 cm) on a floured work surface. Line a greased tart tin (11 x 35 cm) with the dough.
Cut off protruding edges. Line dough with baking paper. Put dry peas on top. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 10 minutes.
Remove baking paper and dried peas and bake the base at the same temperature for 5-10 minutes until golden brown. Remove and let cool.
Halve the lemon and squeeze the juice. Bring raspberry puree, sugar and lemon juice to the boil, then remove from the heat. Mix starch, egg yolks and 3-4 tbsp. water and stir into the raspberry cream. Add 60 g butter, stir in raspberry cream and bring to the boil until the butter has melted.
Spread the cream on the base and spread the rest of the raspberries on top. Chill the tarte for about 3 hours. If necessary, dust with icing sugar before serving.