Defrost the strawberries. Put 75 g cold butter with icing sugar, salt, 2 tablespoons of cold water and flour in a bowl. Knead first with the dough hooks of the hand mixer, then with your hands to a smooth dough. Grease a tightly closing, square springform pan (24 x 24 cm). Pour in the dough and press it with your hands to a flat bottom. Chill for about 30 minutes and prick the base several times with a fork. Bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 20 minutes
Halve and squeeze the lemons (300 ml lemon juice). Puree the strawberries with some lemon juice. Boil lemon-strawberry puree with sugar, 75 g butter and lemon juice. Stir starch and 7 tbsp. water until smooth, thicken puree with it, simmer for about 1 minute while stirring. Remove from the stove. Mix egg yolks and 2 tbsp. hot cream, then stir into the remaining cream. Pour the cream into the tin and bake again at the same temperature for about 20 minutes
Take out, let it cool down, remove the edge of the tin, cut the cake into approx. 64 squares (approx. 3 x 3 cm). Dust with icing sugar
waiting time approx. 2 hours