Preheat the oven to 220 ° C. Wash the grapes, peel them off and place on heat-resistant deep plates.
Mix the wine with the cream, eggs, custard powder, vanilla sugar and sugar well and cook over a low heat, stirring constantly, until the mixture is thick and creamy. Pour it over the grapes and bake on the top shelf at 220 ° C for about 10 minutes. Sprinkle with icing sugar and toasted almond flakes and serve immediately.