String Beans and Potatoes in Tomato Sauce

2 lbs string beans

2 onions, chopped

3/4 c oil

1 can tomato sauce

2 tsp salt

pepper

chopped parsley & mint

2 potatoes, cut in quarters

1 c water

Saute onions lightly in oil. Add tomato sauce, S&P, and simmer for 15 min. Add remaining ingredients. Cover and cook slowly for 1 hour, till tender. Serves 4-6