Tomato-Tuna Treat

1 large onion, chopped
1 cup chopped celery
3 tablespoons butter or margarine
2 cans (7oz each) tuna
1 pkg (10oz) frozen peas
2 cups tomato juice
1 cup water
1 tsp salt
1 tsp sugar
1 tsp basil

Saute onion and celery in butter until soft in a kettle. Drain tuna and break into chunks, stir into onion mixture with frozen peas, tomato juice, water, salt, sugar, and basil. Cover. Simmer 30 minutes to blend.