Wash the lentils thoroughly and soak for 15 minutes. Add the lentils, 1/2 tsp salt, pinch of turmeric, 500ml water in a pressure cooker, and wait for 3-4 whistles.
In a wok, heat oil. Then, add heeng and cumin. Saute chopped onions till golden-brown. Then, add ginger, garlic paste, remaining spices, chopped tomatoes, and cook till the oil leaves the mixture.
Transfer the boiled dal into the wok and mix well. Pour the dal into a serving container.
Temper with ghee, dry red chillies, and jeera. Pour it over the dal.
Use coriander leaves for garnishing.