Cook macaroni in boiling water for 12 minutes, or according to package directions. Immediately rinse with cold water and drain well. Place in a mixing bowl. Add chopped eggs, onion, pickle, celery, capers, peas and pimento.
Combine mayonnaise, pickle juice, mustard, pepper, salt, and sour cream. Add to macaroni mixture. Add parsley. Toss lightly with 2 forks to combine. Chill before serving. May also add tuna to this for a great Tuna-Mac salad!