Cut dominoes into small pieces, except for 4 pieces for decoration. Wash apples and grate dry. Remove the core with an apple corer. Fill the dominoes into the apples and place them on a baking tray lined with baking paper. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 20 minutes. In the meantime, bring milk to the boil, except for 6 tablespoons.
Stir the remaining milk, sugar and sauce powder until smooth. Stir into the boiling milk and bring to the boil while stirring. Pour the sauce on 4 plates. Arrange apples on top and dust with cocoa. Decorate with chocolate rolls and dominoes