Dice the onion, carrot, leek, and celery and roast in a little oil
Sprinkle powdered sugar in the middle of the pot and let it caramelize. Stir in tomato paste and roast with it.
Pour red wine on and let it simmer
Pour in the vegetable stock or game stock. Add spices (garlic, ginger, cinnamon stick, juniper berries, allspice, peppercorns, orange slices, thyme). Let everything simmer nicely and pour in stock every now and then
After about 60 minutes, filter everything through a sieve. Put the sauce back in the saucepan and season with rose hip jam, salt and pepper. If necessary, thicken slightly with cornstarch.