Slowly melt sugar in a saucepan over low heat, caramelize until light brown and deglaze with cherry juice while stirring. Add 1 teaspoon of cinnamon and vanilla sugar and simmer for approx. 5 minutes. Add the plums to the stock and stew for 2-3 minutes. Remove with a slotted spoon and set aside.
Mix the starch with a tablespoon of water in a small container until smooth. Bring the stock to the boil, stir in the mixed starches and simmer everything for about 1 minute. Fold in the plums again and then leave to cool.
Whip the cream and 1 pinch of cinnamon until stiff.
Arrange the caramel and plum compote in glasses and add a dollop of cream to each one.