After 2 hours, remove water and place moong in a big pot with 4 cups of water. Put it on the high flame and once it starts boiling, reduce heat to medium and cook covered for another 20 min.
Add another cup of water and let it boil covered on medium heat for another 10 minutes. Moong are done when they have soft and a bit mashed consistency.
Meanwhile, chop the onion and tomato. keep aside.
Put oil in a different pan, add cumin seeds. Once the cumin seeds splutter, add chopped onions and ginger-garlic paste.
After 5 min. add tomato, turmeric, chili, cumin and coriander powders. Simmer for another 10 min.
Add this mixture, salt and lemon juice to boiled moong and let it simmer for 5 min.
Sprinke a little ghee & corriander.
Serve either as a soup with bread or with rice/chapati as a main meal. It can also be best combined with Avocado, tomato & beetroot raita.