1/3 c. oil
3 tbsp. vinegar
1/2 tsp. salt
1/4 tsp. pepper
1 can (16 oz.) whole green beans, drained
2 cooked potatoes, peeled and diced
1 can tuna
1 sm. onion, sliced thin

Stir together oil, vinegar, salt and pepper. Add remaining ingredients. Toss to mix. Chill and serve.