1. Mix and wash dals well. Soak for 30 minutes. Pressure cook till soft but not over cooked. (approx. 3 whistles) Mash a little with the back of a spoon, while hot.
2. Heat butter in a deep pan. Add seeds, allow to splutter.
3. Add onion, ginger and green chilies. Stir fry till soft, add masalas (red chilies and salt), dals and mix well. Bring to a boil and simmer for 3-4 minutes.
4. Garnish with chopped coriander and lemon juice.
Serve hot with rice and rotis

Serves 4.