Heat 3 tablespoons of oil in a pan and saute 1″ chopped ginger, three big sliced onions and 3-4 green chillies.
Let the onion cook till pink .
Add half chopped tomato, coriander powder, red chilly powder, garam masala, turmeric powder and salt to taste.
Mix well, cover and cook on slow flame. Add half cup of water and the boiled potatoes.
Mix well.
Add the complete can of coconut milk and bring to a boil.
Check for salt and spices, and serve hot.