Potato Tomato Curry (Alu Tamatar)

I came across this easy recipe, that utilizes the minimum of spices to yield a delicious curry.
Ingredients:
1/2 lbs. potatoes, peeled, cooked and cubed
1/2 lbs. tomatoes, cubed
1 tsp. ginger paste
1 tsp. coriander powder
1 tsp. salt or to taste, rock salt preferable
1 tsp. chilli powder (optional)
Cilantro/coriander leaves
1 tablespoon oil
Method:
Heat oil in a small non-stick frying pan (or skillet) and fry the ginger paste and coriander powder
for half a minute, before adding the potatoes and tomatoes, salt and chilli powder. Cook until
done (about 10 minutes), add 1/2 cup warm water and simmer, and garnish with
cilantro/coriander.