Drain the plums and collect the juice. Measure out 100 ml of juice. Bring to the boil with cinnamon, aniseed, 2 tablespoons of sugar and wine. Stir starch and 2 tablespoons cold water until smooth. Stir into the boiling prune juice and simmer for about 1 minute.
Stir in plums. Remove cinnamon and aniseed.
Preheat oven (electric cooker: 200°C/circulating air: 175°C/gas: level 3). Grease one large or four small ovenproof dishes. Quickly knead flour, baking powder, 50 g sugar, vanilla sugar, 1 pinch of salt, egg yolk and butter in flakes with your hands to form crumbles.
Spread the plum compote and crumbles in the moulds. Bake in the oven for 25-30 minutes. Dust crumble with icing sugar. Serve lukewarm or cold. Serve with vanilla ice cream.