Cut 2 oranges in half, squeeze the juice. Peel 8 oranges so that the white skin is completely removed. Remove the fillets with a sharp knife between the parting skins. Squeeze juice from the parting skins to the remaining juice.
Caramelise 3 tablespoons of sugar in a saucepan. Deglaze with liqueur and 3/4 of the juice. Simmer at low heat until the sugar is dissolved. Stir the rest of the juice with starch until smooth and pour into the juice.
Bring to the boil, add the orange filets and stir in. Pour compote into a bowl.
Roughly chop the nuts. Place the flour, ground nuts, 100 g sugar, vanillin sugar, egg yolk, salt and butter in flakes in a mixing bowl and work into crumbles with your hands.
Divide the compote into 4-6 ovenproof moulds (each containing approx. 150 ml). Sprinkle with crumbles. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 20-25 minutes.
Take out and let cool lukewarm. Whipped cream tastes good with it.