Bring milk to the boil, add rice, sugar and 1 pinch of salt. Leave to swell for approx. 30 minutes over low heat, stirring occasionally. Roughly chop the sweets and put them into a small pot with the cream.
Simmer the sauce over medium heat for about 5 minutes until the candies have melted. Coarsely chop the walnuts. Wash the grapes. Pluck the grapes from the stalks and cut in half. Arrange rice pudding and grapes in bowls, sprinkle with walnuts and drizzle with caramel sauce.