In a pot or a pressure cooker, heat 1 tbsp ghee and add 1tsp cumin seeds. Fry the sliced onions until light gold in this ghee. Now add tomatoes, chopped spinach, salt, chilli powder, haldi powder and asafoetida. Fry this masala for about five minutes. Add the soaked dal and 3 cups of water. Once it starts bubbling, cover and simmer cook on low medium flame until the dal softens. It should take about 25 minutes in this process.