1. Boil together lentil and tomatoes till tender .
2. Heat fat .Fry red chillies broken into small pieces .
3.Add mustard seeds ,cumin and curry leaves .
4. When mustard seeds crackle add ground ginger and garlic , turmeric , tomato mixture and salt .
5. Bring to boil .Add garam masala and chopped coriander leaves and remove .