Separate the egg. Stir egg yolk, 6 tablespoons milk and 4 tablespoons starch until smooth. Bring the remaining milk, sugar, vanillin sugar, lemon zest and salt to the boil. Stir in poppy seeds and starch and bring to the boil again briefly. Cool down
Separately beat egg whites and cream until stiff. Fold into the poppy seed mixture. Chill for at least 4 hours.
Drain the cherries and collect the juice. Mix 1 tablespoon starch and 3 tablespoons cherry juice until smooth. Boil up the rest of the juice. Stir in the starch and bring to the boil again briefly. Fold in the cherries. Let cool down
Use a moistened tablespoon to remove the cams from the mousse. Serve with the cherries. Decorate with lemon balm
Only ground poppy seeds unfold their full aroma. You can have it freshly ground in a health food store, for example. If you freeze the remains, it does not become rancid and keeps for about 3 months.