Drain the cherries and collect the juice. Mix 3 tablespoons cherry juice, sugar and sauce powder. Bring the rest of the cherry juice and 100 ml water to the boil. Stir the sauce powder into the juice and bring to the boil again. Carefully fold in the cherries and let everything cool down.
Mix the milk, liqueur and chocolate mousse powder with the whisk of the hand mixer and whip until creamy for approx. 3 minutes at highest speed. Put the mousse in a cool place for about 5 minutes and fill it into a piping bag with star-shaped spout. Divide the cherry compote between 4 plates, squirt the mousse onto the plates and sprinkle with chocolate shavings. Serve decorated with lemon balm, whipped cream and biscuits