Soak the chillies in vinegar for about 10 minutes. Peel garlic and chop coarsely. Peel ginger and chop finely. Finely puree the chillies, vinegar, garlic and ginger with the cutting stick of the hand mixer.
Add salt, cumin, pepper, cinnamon, cardamom, cloves and nutmeg and stir in. Mix the spice paste into the meat and marinate covered for about 1 hour. In the meantime peel and finely dice the onions.
Heat oil in a pot and fry the drained meat in it. Finally add onions and brown briefly. Add the marinade and approx. 1/8 litre of water and braise covered for approx. 50 minutes.
Stir in brown sugar and serve sprinkled with leek and chilli. Rice tastes good with it.