Wash and peel the beetroot. Chop them as small cubes. Add beetroot, turmeric, chilli powder and 1 cup of water to a pressure cooker and cook them for 1 or 2 whistles.
When the pressure goes off, remove the lid and cook it on a high flame for 2-3mins to evaporate the excess of water.
Heat oil in a frying pan or kadai.
Add mustard seeds, cumin seeds when they splutters, add urad dal and red chillies.
When the urad dal is turning brown, add beetroot, salt and mix well. Cook for 5 mins.
When the water is completely goes off then add grated coconut. Fresh coconut gives a good flavor to the curry if not you can also use copra powder. Copra powder is also good but fresh coconut gives more flavor than dry. Mix well and switch off the flame.
Beetroot poriyal is ready to serve. Serve hot with white rice or chapati.