Till the beetroot cubes get cooked, we can get the masala ready. In a wok or pan add 2 tsp of oil and coriander seeds. Fry them on medium flame till the color deepens. Transfer them on to plate and roast the lentils followed by cumin seeds, red chillies and curry leaves adding oil as needed.
Transfer all the roasted ingredients in to mixer along with grated coconut. And grind them in to fine paste adding water appropriately. Coconut masala for the curry is ready now.
While the beetroot cubes are still cooking, add tamarind extract and little salt. Let them cook till soft.
Once the beetroot cubes are soft enough, include cooked pigeon pea lentil, salt and coconut masala from step 3. Combine well.
Add additional water to bring the curry to the right consistency, as the curry boils for 2 minutes then switch off the flame. Meanwhile heat a tempering pan add oil, mustard seeds, split black gram lentils, curry leaves. As the mustard seeds start popping include sliced onions and saute till they turn transparent. Transfer the tempering to the beetroot curry.
Gorgeous purple colored beetroot curry is ready to relish with rice.