Bring the milk, vanillin sugar, sugar, salt and lemon zest to the boil. In the meantime, beat the egg whites with the whisk of the hand mixer until stiff. Remove lemon zest from the milk.
Stir semolina and bitter almond flavour into the boiling milk and let it swell for about 3 minutes. Remove semolina from the stove and fold in beaten egg white. Fill semolina flummery into 4 portion moulds rinsed with cold water, smooth them down and put them in a cool place for 2 hours.
Drain the cherries on a sieve and collect the cherry juice. Stir cornflour and 3 tablespoons of cherry juice until smooth. Bring the rest of the cherry juice to the boil, stir in the cornflour and bring to the boil again.
Fold in the cherries and allow to cool. Peel and slice the banana. Turn over semolina flummery and arrange on a breakfast plate with stewed cherries and banana slices and serve decorated with lemon balm and chocolate as desired.