How to cook Potato in Curd Gravy?

Ingredients
Potatoes.......................................3 medium (boiled and peeled) 
Curd.............................................1 cup (blended)
Red chili powder............................1/2 tsp
Coriander Powder..........................1/2 tsp
Turmeric Powder...........................1/4 tsp
Garam Masala...............................1/4 tsp
Cumin seed....................................1tsp
Musturd seeds...............................1tsp
Asofotadia.....................................2 pinches
Ginger-Garlic.................................1/2 tsp (grated)
Oil................................................1 tsp
Wheat flour...................................1/4 tsp
Curry leaves..................................1 stalk
Green chilies..................................2 pc (slit)
Water............................................1 1/4 cups

Method

1. Cut potatoes into big pieces. Mash 3-4 pieces with hand. Keep both aside.

2. Mix all the dry masala in 1/4 cup water.

3. Heat oil in a deep cooking pan. Add the cumin and mustard seeds. When they splutter, add ginger-garlic, chilli and curry leaves. Add the masala mixture and fry for 2 minutes. 

4. Add beaten curd and fry for 5 minutes or till the curd loses its whiteness. Stir continuously after adding curd. 

5. Add the remaining water and all the potato and flour. Stir well. Boil and simmer for 10 minutes or till gravy thickens 

6. Garnish with chopped coriander. Serve hot with thin wheat chapattis or rice.