Chop the chocolate, melt it with milk and butter over a warm water bath. Separate the eggs. Pour chocolate butter mixture into a bowl. Stir in egg yolks bit by bit. Also stir in hazelnuts and 4 tablespoons of sugar.
Beat the egg whites and 1 pinch of salt until stiff with the whisk of the hand mixer. Carefully fold into the chocolate mixture.
Pour the dough into a springform pan (26 cm Ø) lined with baking paper at the bottom and smooth it down. Bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 25-30 minutes.
Let it rest in the switched off oven for about 15 minutes. Then take out and let it cool down on a cake rack.
For the orange compote cut the vanilla pod lengthwise. Peel 4 oranges so that the white skin is completely removed. Remove the fillets with a sharp knife between the parting skins. Press the juice out of the parting skins.
Cut 2 oranges in half, squeeze the juice.
Put orange juice, white wine, 2 tablespoons of sugar, cardamom, cinnamon and vanilla pod in a pot, heat up. Stir starch with a little water until smooth. Stir into the boiling juice and simmer for about 1 minute.
Remove from the heat and let it cool down a little. Remove cardamom capsules, cinnamon and vanilla pod if necessary. Add orange fillets to the orange sauce.
Beat the egg white and 1 pinch of salt until stiff. Gradually add 100 g sugar. Pour the mixture into a piping bag with a perforated spout. Remove the base from the mould. Spray tuffs onto the bottom. Meringue tuffs with a cream-brulée burner.
Alternatively, brown meringue briefly under the preheated grill of the oven. Serve with orange compote.