For this aviyal made of raw tomatoes, the onion to be added is cut lengthwise into thin pieces. The tomatoes are also cut in a similar manner and added to the onion.
Grind together grated coconut, turmeric powder, chilli powder, cumin seeds, green chillies and curry leaves, making sure that the coconut does not become a smooth paste. Add this rough paste to the tomato-onion mixture and cook with just enough water. Once the water has boiled and evaporated, take off the fire. Finally add some coconut oil and with that your aviyal is ready.