Place the onion,ginger,garlic,mint and fresh coriander(cilantro) in a food processor along with a little water.Blend to make a paste.Keep aside.
In a skillet or a wok heat oil.
Transfer the mint paste into the oil and saute for about 5-6 minutes until the raw onion smell disappears.
Add the spices and continue to cook until all aromatic about 3-4 minutes.
Add the yoghurt and tomato paste and cook until you see oil separating from the sides.
Add the water and salt.Bring to a boil.
Add the Salmon, reduce the heat.Cover and cook until Salmon is fully cooked.(about 6-8 minutes)
Check seasonings.
Serve hot with some rice.Enjoy.