Potato Curry with Yougurt Gravy

Let's prepare indian dish with Manjula!
INGREDIENTS:
Recipe for 4 servings:
2 large boiled potatoes
2 tablespoons oil
1/2 teaspoon cumin seeds
pinch of hing (asafoetida)
2 teaspoons gram flour or all purpose
1 bay leaf
4 tablespoons yogurt
1 teaspoon grated ginger
1 teaspoon fine chopped green chilly
1 tablespoon coriander powder
1/2 teaspoon of turmeric powder
1/2 teaspoon paprika
1 teaspoon salt
1/4 cup chopped cilantro
1 1/2 cups of water