Combine in large salad bowl:
8 cups of romaine lettuce, cut into chunks
1 can of water-packed tuna, drained (6-1/2 ounce can)
1 onion, sliced and diced
3 tomatoes, cut into chunks
4 black olives, halved
1/4 cup of Italian salad dressing -or- olive oil & lemon dressing
Toss to coat well. Makes 4 servings.