Theeyal is one of my favorite side dish with rice. This is my mom's version of theeyal with lots of vegetables in it, usually the kind of vegetables used in avial. The vegetables are first cooked and the fried coconut gravy with spices is added towards the end. Tamarind exract is usually used as the souring agent.
Recipe courtesy: Kerala Recipes. I didn't use beetroot as mentioned in the recipe.