Wash and soak the black chana overnight or for at least 7 to 8 hours. Rinse the water a couple of times.
Take it in a pressure cooker and along with salt, pressure cook until tender. Keep it aside.
Wash and soak the tamarind, extract the pulp and keep it aside.
In a nonstick pan, heat 1 tsp oil and fry all the ingredients listed for the paste.
Allow it to cool down and grind to a smooth paste.
Heat the pan again with oil, saute finely chopped onions, then add ginger garlic paste, and green chilies.
Once the onions start to turn brown, add chopped tomatoes. Add salt and turmeric powder, let the tomatoes turn mushy.
Now add the boiled black chana along with tamarind, bring to a boil.
Add the ground masala, and continue stirring for the mixture to get mixed well.
Add the required amount of water. Cook on high for the mixture to boil over.
Simmer for 10 mins for the gravy to thicken.
Serve hot with Appams.