Peel oranges so that the white skin is completely removed. Remove the fillets with a sharp knife between the parting skins. Squeeze out juice (should be approx. 200 ml). Caramelise the sugar in a saucepan, add orange juice, bring to the boil and dissolve the caramel. Boil down the liquid until it throws thick bubbles. Add orange filets to the caramel, set aside
Heat the fat pan of the oven in the preheated oven (electric oven: 200 °C/ circulating air: 175 °C/ gas: level 3) for approx. 10 minutes. In the meantime, separate the eggs. Whisk egg yolks, vanilla sugar, 20 g sugar, salt and milk. Gradually stir in flour. Beat the egg whites until stiff, adding 50 g of sugar. Carefully fold the beaten egg whites into the dough. Chop the cranberries coarsely and stir into the dough
Grease the hot fat pan well, add the dough and spread loosely. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) on the middle shelf for approx. 8 minutes. Take out the fat pan. Tear the sardines into pieces with 2 spoons. Dust with approx. 3 tsp. icing sugar and bake for approx. 3 minutes at the same temperature. Serve with caramelized oranges and dust with the remaining icing sugar. Sprinkle the pistachios over the orange fillets