Pressure cook the moong dal adding 3 cups of water for 3 whistles.
Heat oil or ghee in a Kadai and add the cumin and let them splutter.
Add asafetida, minced garlic, onions, and saute till onions turn light brown in color.
Add tomatoes, spices like turmeric powder, red chili powder, garam masala powder, salt, and cook till tomatoes turn soft, which takes 2-3 minutes.
Now add the cooked and mashed dal, stir well. Add water to adjust consistency and salt to taste.
Boil dal for 2-3 minutes on a medium-low flame. Finally, add chopped coriander leaves.
Moong Dal Tadka or Yellow lentil soup is ready, add extra tempering (tadka) and serve hot with boiled rice, quinoa, or roti.