Cut butter into pieces. Knead butter, sugar, egg yolk and flour. Wrap the dough in foil and chill for about 30 minutes. Cut dough into 8 equal pieces. Grease the moulds (approx. 7 cm Ø/ 40 ml content) and dust with flour. Press the dough into the moulds, making sure that the rim is evenly thick.
Prick the bottom of the tartlets with a fork. Chill the moulds for about 20 minutes. Chop the chocolate. Heat the cream, remove from the heat, melt 100 g of chocolate in the hot cream. Let it cool down for about 1 hour. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas mark 3) for 10-12 minutes. Remove the moulds, allow to cool slightly and turn over. Let the tartlets cool down completely. Pour the chocolate cream into the tartelettes, chill for at least 4 hours. Melt the remaining chocolate over a warm water bath. Pour chocolate into a piping bag or freezer bag and cut off a small corner. Spray chocolate in lines onto a plate.
Let the tartlets cool down completely. Pour the chocolate cream into the tartelettes, chill for at least 4 hours. Melt the remaining chocolate over a warm water bath. Pour chocolate into a piping bag or freezer bag and cut off a small corner. Spray chocolate in lines onto a plate. Drain the apricots and cut into thin slices. Arrange apricots, cranberries and tartlets on the plate. Dust the tartelettes with cocoa and decorate with chocolate rolls