Coarsely chop the peanuts. Roast in a pan without fat, remove. Peel pineapple, cut out hard core. Cut pineapple into thin slices. Cut mango halves from the stone. Peel flesh and cut into thin slices.
Heat the butter in a frying pan. Briefly sauté the pineapple slices in it and remove. Add vanilla sugar to the pan and allow to caramelize slightly. Deglaze with lime and pineapple juice, let it boil down a bit.
Arrange pineapple and mango slices on 4 plates, spread caramel juice on top. Add 1 scoop of ice cream to each plate and sprinkle with the nuts. Decorate with melissa.