Wash and core the sour cherries. Remove the peel from the bananas and cut into 3 cm pieces. Add all other ingredients, leave to stand for about 3 hours and then simmer for 4 minutes. Do not mash the bananas. They remain as a piece.
Then pour everything into hot, cleaned twist-off glasses and let them cool down.
The sweetness of the banana and the acidity of the cherries go well together.