Cheddar Macaroni Salad

3 cups medium shell macaroni
2 cups cubed cheddar cheese
1 cup chopped celery
2 cup chopped green pepper
1/4 cup chopped onion
1 cup mayonnaise
1 cup sour cream
1/4 cup milk
2 cup sweet pickle relish
4 tsp. vinegar
1 1/2 tsp. mustard
3/4 tsp. salt

In large kettle cook macaroni in a large amount of boiling salted water till tender; drain. Cool to room temperature. Toss with cheese, celery, green pepper, and onion. Combine sour cream, mayonnaise, and milk; stir in relish, vinegar, mustard, and salt. Toss with macaroni mixture. Cover; chill several hours. Serve in lettuce-lined bowl. Garnish with green pepper rings, if desired. Makes 12 servings.