Weigh the peeled bananas, weigh out the same amount of preserving sugar 1: 1 and prepare. Peel the bananas and cut into pieces. Remove brown spots as you can see them in the glass later.
Simmer for several minutes with the fruit juice, a little sugar and the vanilla pod cut lengthways, from which the pulp comes off by itself, stirring occasionally. Remove the vanilla pod, then puree everything and leave it covered for 2 hours so that the vanilla aroma can unfold.
Cook everything with the preserving sugar and lemon or ascorbic acid according to the instructions on the sugar pack, pour into prepared glasses and let them cool upside down.