Chicken Salad(Weight Watchers) - cooking recipe

Ingredients

6 oz. skinned and boned boiled chicken, diced
20 small red seedless grapes, cut into halves
1 small red Delicious or McIntosh apple, cored and diced
1/2 c. diced celery
1/4 c. diced onion
1 Tbsp. plus 1 tsp. reduced-calorie mayonnaise
1 tsp. each: distilled white vinegar and lemon juice
dash each: salt and pepper
2 medium tomatoes
4 lettuce leaves

Preparation

In medium mixing bowl, combine all ingredients, except tomatoes and lettuce; cover with plastic wrap and refrigerate until thoroughly chilled, at least 1 hour.