Peel oranges so that the white skin is completely removed. Cut the fruit into slices. Heat jam in an ovenproof pan (28 cm Ø). Stir in vanilla pulp and spread orange slices.
Sprinkle with 25 g almonds. Remove from the stove. For the dough, whisk eggs and 125 g sugar until thick and creamy. Mix the flour, 25 g almonds, starch and baking powder and stir into the egg mixture alternately with the milk.
Fill the dough onto the sprinkled orange slices. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 20 minutes. Carefully turn out of the tin. Sprinkle with 1 tablespoon of sugar and cook under the hot grill for another 5 minutes.
Let it cool down a bit and serve it delicately dusted with icing sugar.