Mix 1 tbsp tamarind in ¼ cup water. In a pressure cooker, take the chopped kakarakaya pieces along with tamarind water and turmeric. Cook for 2-3 whistles (depending on your cooker, I cooked for 3 whistles in mine) until the pieces are tender, but not mushy. Remove, drain and rinse with cold water. Squeeze the extra water and keep aside.
While the veggies are cooking, grind all the ingredients for masala with little water to make a smooth paste. (You can grind the ingredients raw or fry them in 1tsp oil for extra depth in flavor.)
Heat 2 tbsp oil in a pan; add the kakarakaya pieces and the masala. Sauté on medium-low flame till the masala paste is cooked thoroughly and turns golden brown and all the moisture evaporates. Serve with rice and dal for a complete meal.