Heat oil in a wok add jeera and mustard. After mustard start popping add onions and curry leaves, fry. After onions turn translucent add ginger garlic paste and fry till raw smell goes off. Add sambar powder and turmeric powder fry for 30 seconds.

Add tomatoes and salt cook till mushy. Add curd mix well and cook for couple of minutes.

Serve hot with rice or chapathi.