In a pressure cooker, add soaked dry peas, turmeric powder, salt and oil. Cover the lid and cook on a medium flame for 4 whistles.
Now in a pan, add oil, cumin seeds, and hing.
Add onion paste and sauté till oil separates from its sides.
Then add garlic paste, ginger paste and green chilli paste. Sauté for a minute.
Now lower the flame and add turmeric powder, red chilli powder, coriander powder, cumin powder, and usal masala. Add some water and sauté masala into oil for a few seconds.
Then add tomato puree and salt. cover and cook gravy till oil separates from its sides.
Add 4 cups of water and bring it to a boil.
Now add boiled peas and mix well.
Then in a bowl, add 2 tbsp besan and some water. mix well and add paste gradually into the gravy.
Now lower the flame and boil usal for 15-20 minutes.
Lastly add garam masala, lemon juice, and some coriander leaves.
Usal is ready.