Take 2 cups (300 grams) of green peas and set them aside.
In a blender, combine 4 onions (pieces), 2 inches of ginger, and 5-7 garlic cloves. Blend into a smooth paste and set aside.
Blend 4 tomatoes into a puree and keep it aside.
In a pressure cooker, heat 6-7 tablespoons of oil. Add the onion-ginger-garlic paste and sauté.
Add the tomato puree and salt. Cover and cook the gravy until the oil separates from its sides.
Reserve some gravy for the "tari" preparation.
Add ½ teaspoon turmeric powder, 1 tablespoon Kashmiri red chili powder, 1 tablespoon coriander powder, ½ teaspoon garam masala, and 1 teaspoon sev usal masala. Sauté.
Add the green peas and sauté.
Pour in 1 cup of water and mix well.
Once the gravy begins to boil, cover the pressure cooker and cook on medium-high flame for 2 whistles.
Allow the pressure cooker to release its pressure naturally. Open the lid and check if the green peas are properly cooked.
For the "rasa," add 2 cups of water and mix well.
In a bowl, mix 1 tablespoon besan with some water. Add this mixture to the gravy.
Reduce the flame and let the usal simmer on low heat for 5-6 minutes until the gravy slightly thickens.
Turn off the heat and add lemon juice and coriander leaves. Mix well. The usal is now ready to serve.