Grind onion, 1 tomato, chilli powder into paste.2) Heat oil. Splutter mustard seeds. Add the ground paste and fry it.3) Add garam masla, onion, green chillies and garlic. Saute till onion are soft.
Add chopped tomatoes . Cover and cook the gravy.5) When the juice of tomato comes out, add turmeric and salt.
Add ½ cup water and cook the gravy.7) Make this in desired consistency.8) Serve hot with chappathi.