Peel oranges so that the white skin is completely removed. Cut oranges into slices. Melt the fat in a pan. Caramelise the sugar in it. Deglaze with lemon and orange juice, bring to the boil briefly.
Turn orange slices in it. Serve with 1 scoop of truffle ice cream. Decorate as you like with orange wheels and mint. Serve sprinkled with pistachios and icing sugar