While the matoki is being steamed prepare the tempering. In a food processor add peanuts, onions and tomatoes and make a smooth paste.
In a pan heat the ghee and add cumin seeds. Once done add the paste and keep stirring. Add ginger, garlic and chilli paste. Let it cook for a minute or so. Now add salt, turmeric, chilli powder, lemon juice and sugar. Stir thoroughly and add 2 cups of water. Cover and let it cook for 6 minutes on low flame or until the ghee leaves sides.