Stuffed Tomato Salad

5 good-sized tomatoes
1 cup diced celery
1 cucumber, peeled and diced
1 tablespoon finely chopped onion
1/3 cup mayonnaise
Lettuce
Salt to taste

Wash the tomatoes, cut the stem and end, and scoop out centers. Dice centers and combine with celery, cucumber, onion and enough salt to suit taste. Then fold in the mayonnaise. Cover and chill the filling and tomato shell separately. Stuff tomatoes with filling and serve at once on crisp lettuce.