For the compote, drain the cherries while collecting the juice in a saucepan. Bring the juice to the boil. Add orange peel. Stir starch with 3 tbsp. water until smooth. Stir into the boiling juice and cook for about 2 minutes.
Stir in the cherries. Let the compote cool down, stirring frequently.
For the mousse, roughly chop the chocolate and melt in a hot water bath. Heat the milk until it has about the same temperature as the chocolate. Then gradually stir into the chocolate. Let it cool down.
Gingerbread crumbles. Drizzle with liqueur and mix. Whip cream until stiff. First stir 1⁄3 into the chocolate milk, then fold in the remaining cream. Pour some mousse into a bowl. Add the stewed cherries, except for 4 tablespoons.
Spread the gingerbread crumbs over it. Add the rest of the mousse, cover and chill for about 2 hours. Add the remaining cherries before serving.