For preparing easy mushroom kuruma, first heat oil in a pan and fry onion.
Add garlic, ginger and green chillies and saute for a few seconds.
Stir in potato cubes and mushroom pieces. Saute well in low flame until the potatoes are browned.
Add 1 cup water, required salt and tomato puree.
Cook in low flame. When the gravy acquires a thick consistency, add garam masala.
Meanwhile grind the grated coconut to a fine paste. Add coconut paste and vinegar to the curry and simmer for a few minutes. Do not boil. Remove the vessel from fire.
Easy mushroom kuruma is ready. Garnish with curry leaves and coriander leaves. Serve hot.