Knead the butter in pieces, flour, cocoa, icing sugar, 1 egg yolk and possibly 1 tbsp. water to a smooth dough. Wrap the dough in foil and chill for approx. 45 minutes
Roll out the dough on a floured work surface until round (approx. 28 cm Ø). Line a greased tart mould with lift-off base (24 cm Ø) with the dough. Fold any protruding edges inwards. Line the dough with baking paper and fill with dried peas
Bake the tart on the lower shelf in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 15 minutes in a blind oven. Then remove peas and paper and bake the tart for another 5 minutes. Take the tart out of the oven and let it cool down on a cake rack
Coarsely chop 100 g chocolate. Boil 400 ml milk and sugar, melt chocolate in it. Mix 2 egg yolks, 100 ml milk and starch until smooth and stir into the milk. Bring to the boil while stirring and simmer for about 1 minute. Pour the pudding on the base and smooth it down
Wash and clean the strawberries, dab them dry and place them on the pudding, pressing slightly. Chill the tarte for about 2 hours. Roughly chop 30 g chocolate. Heat the cream and melt the chocolate in it. Stir the sauce until smooth and let it cool down while stirring occasionally. Spread the chocolate sauce over the strawberries before serving
waiting time approx. 3 1/2 hours