Wash toor dal twice in water. Roughly chop green tomatoes and set aside. Slit green chillies in two.
In a pressure cooker add, dal, water, tomatoes, chillies and salt. Boil for 2-3 whistles or for 10 mins on sim. Wait aside till all the steam escapes
In a small pan heat ghee and all the tadka ingredients till they splutter. Pour on dal and simmer for 5 mins. Add chopped coriander leaves, switch off the heat cover and let it rest for 10 mins. Serve with steamed rice and some pickle for good measure.