1 c. seedless grapes - red
1 c. apples, diced unpeeled
1 c. (7 oz.) tuna
1/2 c. chopped walnuts
1/2 c. mayonnaise
2 tbsp. fresh lemon juice
1 c. diced celery

Combine all ingredients and toss lightly. Serve on bed of lettuce and garnish with additional grapes.