Tasty Makhana Aloo Curry Recipe

2 tablespoons oil
1 teaspoon cumin seeds
2 green chillies, finely chopped
2 onions, made into a paste
2 tomatoes, made into a paste
2 potatoes, peeled and chopped
1 teaspoon garam masala powder
1 teaspoon red chilli powder
1 teaspoon coriander powder
1 cup makhana (fox nuts)
Salt to taste
Fresh coriander for garnish