Potato Masala Curry

Ingredients
Potatoes - 2 or 3
Onion (medium) - 1/2
Tomato - 1
Green chilli - 1
Mustard seeds - 1/4 tsp
Besan flour - 2 tbsp
Curry masala powder - 1 tsp
Turmeric powder - 1/4 tsp
Salt
Oil

Pressure cook the potatoes, mash them and keep aside.
Heat oil in a pan, and add mustard seeds. When they start to splutter, add chopped onion and green chilli and fry till onion turns golden brown.
Add chopped tomato and turmeric powder and fry till tomatoes are soft. Add 1 cup of water and bring it to a boil.
Add besan flour, curry masala powder and fry for a couple of minutes. Then add the mashed potatoes, salt and enough water to bring it to consistency.
Boil the masala for 5 minutes. This potato masala can be served with roti or naan.