- At first cut fishes both side by knife 1 inch gape then marinate it by lemon juice and salt then add on it ginger garlic paste and keep it in refrigerator for 30 minutes. After that take out from refrigerator and brush mustard oil on it then keep it on a grilled jali and keep it to gasoven and grill for 10 minutes at midium flam then turn the fish and again brush mustard oil on it and grilled for 10 minutes.