Whisk egg yolk and sugar in a hot water bath for approx. 10 minutes until light creamy. Allow the cream to cool slightly
Remove the flesh from 1 mango and puree. Stir crème fraîche and yoghurt into the egg cream
Line a box mould (approx. 3/4 l capacity or empty ice tray with 1 l capacity) with foil. Spread cream into the mould. Pour mango puree on top of it and fold it in with a fork, creating a "marble effect". Freeze overnight
Peel 1 mango, cut the flesh in thin slices from the stone. Put about 12 slices aside. Puree the rest of the mango. Turn out the parfait, remove the foil. Cut parfait into about 8 slices. Arrange with mango puree and slices, decorate with fruit and mint leaves