Waldorf Tuna Salad

Ingredients

• 2 cans (6 ounces each) light water-packed tuna, drained and flaked
• 1 large red apple, chopped
• 1/3 cup chopped celery
• 1/3 cup raisins
• 1/3 cup chopped dates
• 1/4 cup chopped walnuts
• 1/2 cup fat-free plain yogurt
• 1/4 cup reduced-fat mayonnaise
• 4 lettuce leaves
• 1/4 cup shredded reduced-fat Monterey Jack cheese