Heat oil in a pan. Add chopped onions and sauté until they soften.
Add the ground masala paste and sauté for a minute.
Add chopped tomatoes and turmeric powder, red chili powder, garam masala powder, salt along with the cooked black eyed beans.
Stir to mix and add 2 cups water or as needed. Mix again.
This usal has a medium consistency, but you can make it slightly thick if you prefer.
Bring to a gentle boil without a lid and then simmer for 8 to 10 minutes.
Check the seasonings and add salt if needed.
Once all the flavors are blended in the curry and you see some oil floating on the top, remove from heat.
Garnish with chopped coriander leaves and serve Chawli Usal hot with steamed rice, chapati or bread.