Add the potatoes, garlic, ginger, chiles, and spices and cook for 5 minutes. Stir in the tomatoes and 1/2 cup water. Cover and simmer until the potatoes are just cooked and the sauce has thickened, adding more water if the potatoes become dry, 15 to 30 minutes.☞ TESTER TIP: If you prefer your food more overtly flavorful and heavily spiced, consider doubling the spices.