Pre-Prep - Start by peeling and chopping one large raw mango into medium-sized pieces. Not too small, we want them to hold shape while cooking. Next, grate your coconut (or take it out of the freezer and thaw if using frozen). Keep all your ingredients measured and ready, it saves you from running around.
Making the Coconut Masala - In a small blender jar, add 1 cup grated coconut, 1 teaspoon cumin seeds, and 1–2 teaspoon red chilli powder or dry red chilies. Don’t add too much water — we want a slightly coarse paste, not a runny one. Give it a good blend and set aside. This is your base gravy.
Cooking the Mango Curry - In a kadai or thick-bottomed pan, add the chopped mango pieces, 1 teaspoon turmeric, a bit of salt, and 1 tablespoon sugar. Pour enough water to just cover the mangoes. Let it cook for 10–15 minutes on medium flame till they’re halfway soft. Now, add the coconut masala to the mangoes. Add a little more water if it looks too thick. Let it simmer gently for another 10 minutes till the mangoes are cooked through and the gravy has thickened nicely.
Tempering and Finishing - In a small tadka pan, heat 1 tablespoon oil. Once hot, add 1 teaspoon mustard seeds and let them crackle. This takes about 30 seconds. Immediately pour this sizzling tempering over the mango curry and give it a gentle stir. And that’s it — Mangai Avial is ready to be served! It tastes amazing with hot rice, sambar, rasam, or even just a dollop of ghee.