First squeeze half the orange. Peel the remaining oranges so that the white skin is completely removed. Cut the oranges into thin slices
Caramelise the sugar at medium heat in a pan until golden. Add fat and melt in it. Add lemon and orange juice (approx. 4 tbsp.) and simmer briefly. Steam orange slices briefly in it and take them out. Leave everything lukewarm or to cool completely
Arrange orange slices with sauce. Form balls from the ice cream or portion the ice cream with a tablespoon. Arrange each on the oranges. Sprinkle with pistachios and icing sugar. Decorate as you like with orange slices and mint