Tuna-Stuffed Jumbo Shells

10 jumbo pasta shells
1/2 cup mayonnaise
2 tablespoons sugar
1 can (12 ounces) tuna, drained
1 cup diced celery
1/2 cup diced green onions
1/2 cup diced green pepper
1/2 cup shredded carrot
2 tablespoons minced fresh parsley

Creamy Celery Dressing:
1/4 cup sour cream
1/4 cup sugar
1/4 cup cider vinegar
2 tablespoons mayonnaise
1 teaspoon celery seed
1 teaspoon onion powder
Lettuce leaves and red onion rings, optional

Cook pasta according to package directions; rinse in cold water and drain. In a bowl, combine mayonnaise and sugar. Stir in tuna, celery, onions, green pepper, carrot and parsley. Spoon into pasta shells; cover and refrigerate.

For the dressing, combine sour cream, sugar, vinegar, mayonnaise, celery seed and onion powder. Arrange lettuce, onion rings and shells on a serving platter; drizzle with dressing. Makes 5 servings.