waldorf salad

1 cup granny smith apples, chopped
1 tablespoon lemon juice
1 cup celery, chopped
1/4 cup mayonnaise
1/4 cup raisins
1/4 cup walnuts

Sprinkle apples with lemon juice after they are cut. Add all other ingredients. Toss to coat all pieces with mayonnaise. Serve in a butter lettuce leaf.