Drain the cherries on a sieve, collecting the juice in a pot. Mix the starch with a little water until smooth. Bring juice to the boil, add orange peel. Remove from the heat and stir in the mixed starch. Bring to the boil while stirring, simmer for about 1 minute. Stir in cherries and let cool down while stirring frequently.
Roughly chop the chocolate and melt it over a warm water bath. Heat milk as well, so that chocolate and milk have about the same temperature. Carefully add the milk while stirring. If the chocolate partially sticks, heat it up again while stirring. Let it cool down
Crumble the gingerbread. Drizzle with liqueur and mix. Whip cream until stiff. Fold 3 tablespoons of cream into the chocolate. Then carefully fold in the remaining cream. Fill about 1/3 of the mousse into a bowl. Carefully place the cherries on top, except for something to decorate. Spread gingerbread crumbs on top. Add the rest of the mousse, chill for about 2 hours. Decorate with remaining cherries just before serving
waiting time approx. 2 hours