1 lb. fresh or frozen cod or haddock
1 med. onion, diced
1 (16 oz.) can tomatoes
2 med. potatoes, peeled and diced
1 tbsp. salad oil
1 1/2 tsp. salt
1/2 tsp. basil
1/4 tsp. pepper
1/4 tsp. sugar
1/4 tsp. thyme (if desired)

Saute onions in salad oil and mix all ingredients, except fish. Simmer until potatoes are tender. Add cubed fish and simmer until fish flakes.