Heat oil in a heavy pot. Sauté onion and garlic. Mix curry with ¼ cup water and add to onion and garlic. Cook for a few minutes until thick.
Add potatoes to the curry and stir until the curry coats the potato; add salt and pepper and continue to cook for a few minutes.
Stir in water. Cover the pot and lower heat. Cook the potatoes until they are tender and liquid has thickened. Season to taste.