waldorf salad recipe

### Ingredients: - **2 cups** chopped apples (Granny Smith or a mix of your favorites) - **1 cup** chopped celery - **1 cup** seedless grapes, halved - **1/2 cup** chopped walnuts - **1/2 cup** mayonnaise - **1 tablespoon** lemon juice - **Salt and pepper**, to taste - **Lettuce leaves**, for serving (optional)