In a pressure cooker or large saucepan, cook all the soaked lentils with the water, salt and turmeric powder. Once cooked and lentils are soft, let simmer for a few minutes.
Add the chopped tomatoes, green chillies, mango powder and garam masala and bring to a boil. Drop in the cooked fenugreek and cook for a minute. Remove from the stove.
Heat the ghee or oil for the tempering. Add all the ingredients and let cook for a minute. Pour the contents onto the cooked dal. Stir. Serve hot with rice or rotis.