Famous Macaroni Salad

1 (16-ounce) package salad macaroni (or ditali pasta)
1 cup celery, diced
1 cup red onion, dice
1 cup yellow or white onion, diced
1 cup medium cheddar, diced
1 cup Swiss cheese, diced
/2 cup Parmesan, grated
1 cup dill pickles, diced
1 cup salami, diced
1 (6-ounce) can large pitted black olives, drained (or 1 cup diced or sliced)
1 to 2 Tablespoons Lowry's garlic salt
1 to 2 Tablespoons fresh minced garlic
1/4 teaspoon dried horseradish
1/2 teaspoon ground white pepper
1 to 2 teaspoons freshly ground black pepper
1/2 teaspoon cayenne pepper
1/2 teaspoon dry mustard
1/2 teaspoon celery salt
1 (3-ounce) jar diced pimentos, rinsed and drained
1 to 1 1/2 cups mayonnaise

Add 2 quarts of water to a medium stockpot and bring to a boil. Add macaroni and cook until it is al dente, approximately 9 minutes. Do not overcook the pasta or it will fall apart when the salad is tossed together. Rinse macaroni until cool. Drain well and let it dry out slightly.

Add pasta to a large bowl. Carefully fold in celery, onion, cheddar, Swiss cheese, Parmesan, dill pickles, salami, and black olives. Refrigerate the mixture, uncovered, overnight (or refrigerate for at least 2 hours).