Ham-Dijon Pasta Salad
["1 (7 oz.) pkg. refrigerated rigatoni, uncooked", "2 c. cubed, cooked ham", "1 c. (4 oz.) shredded Swiss cheese", "1 carrot, scraped and thinly sliced", "1/2 tsp. freshly ground pepper", "1 (8 oz.) carton plain low-fat yogurt or nonfat sour cream alternative", "1 Tbsp. Dijon mustard", "lettuce leaves"]
["Cook pasta according to package directions; drain. Rinse with cold water; drain.", "Combine pasta and next 4 ingredients.", "Set aside."]
["rigatoni", "Swiss cheese", "carrot", "freshly ground pepper", "mustard", "lettuce leaves"]