3 red apples, unpeeled and diced
2 tbsp. lemon juice
1 c. seedless green grapes, halved
1/2 c. diced Swiss cheese
1/2 c. coarsely chopped nuts
1/3 c. mayonnaise

Sprinkle apples with lemon juice and toss lightly. Add the next 4 ingredients and mix well. Serve on lettuce leaves.