Pressure cook dal until soft and mushy.
Heat 2tsp oil in a saucepan; add the mustard and cumin seeds; after they splutter add red chilies and hing, sauté for few seconds.
Then add chopped tomatoes, green chilies; cover and cook until tomatoes are cooked and turn mushy.
Add cooked dal, red chili powder, masala powder and salt; simmer for 10 minutes on medium flame.