Chop the chocolate for the filling. Heat the cream and dissolve the chocolate in it. Chill for about 4 hours. In the meantime, knead butter in flakes, sugar, flour and 1 tablespoon of cold water to a smooth dough. Chill for 30 minutes. Then roll out approx. 5 mm thick on a floured work surface. Cut out circles (approx. 8 cm Ø) and place them in greased, flour-spread tartlet cups (approx. 6 cm Ø).
Press the dough into the form, prick the bases. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 2) for about 12 minutes. Allow to cool slightly, turn out of the baking tins and allow to cool completely. Whip the cream briefly with the whisks of the hand mixer. Cut off the balls and place in the tartlets. Decorate each ball with a coloured truffle. Sprinkle with sliced chocolate