Clean the fish using water and wipe dry using kitchen towel. Roast gram flour in 1 tsp oil at low to medium heat till slightly golden color. Take 1/2 cup yogurt or curd in muslin cloth and hang it till water stops draining. Wrap the hung curd cloth with 3 layers of kitchen paper towel so that it absorbs remaining moisture from the curd to make curd more thicker. In a mixing bowl, add hung curd, garam masala, salt, tandoori masala, mint & coriander chutney, roasted gram flour, garlic & ginger paste, lemon juice and mustard oil. Mix all ingredients very nicely. Add salmon fish and rub the marination masala from both side. Refrigerate the marinated fish placing it in zip lock bag for 1-2 hrs.