Ingredients

• 1 teaspoon lemon juice
• 2 1/2 cups diced apples
• 1 cup celery, in thin strips about 1-inch long
• 1/2 cup broken walnuts
• 1 tablespoon Splenda granular (sugar substitute)
• 1 dash salt
• 1/2 cup low-fat vanilla yogurt
• 2 tablespoons low-fat mayonnaise
• crisp lettuce leaf