Wash and pressure the toor dal along with turmeric powder till done.
Once the pressure falls, mash well, transfer to a bowl. Add the tamarind pulp, chopped tomatoes, peeled small onions, sambar powder, grated coconut, salt and coriander leaves. Add water as per requirement.
Again pressure cook for a whistle. Wait for the pressure to fall down.
Heat a small pan with oil, temper with the sambar whole spice mix. Add curry leaves. Pour this over the cooked sambar. Simmer for 5 mins.