Add 1:1 light soya and dark soya, enough that the duck is lightly dipping in it's marinade. Add the garam masala and a grainy paste of garlic ginger and the chillies.

Marinade for 1-2 hours, or overnight.

In a non stick pan, add soyabean oil and fry the onions till brown. Keep them separately.

Heat some more oil and add the duck with it's marinade and the onions. Add the cinnamon. Cover it and let it cook (add some water if required)for 40 minutes on sim flame. Check if it's soft.