Peel and wash the potatoes, then cut into medium-sized pieces. Chop the herbs and garlic together.
Heat the oil in a heavy-based casserole. Add the chopped herbs and garlic, cook for 2 minutes, then add the potatoes.
Cook for 3 minutes, add the spices and salt to taste, then pour in the water. Cover the pan, lower the heat, and cook for 15 minutes until the sauce has reduced.