TUNA MACARONI SALAD 3 cups macaroni 1/3 cup Italian-style salad dressing 1/2 cup sour cream 1 cup mayonnaise 1 onion, chopped 2 stalks celery, chopped 1/2 teaspoon garlic powder 1 teaspoon salt 1/2 teaspoon ground black pepper 1 (6 ounce) can tuna, drained Cook pasta in a large pot of boiling salted water until done. Drain. Marinate macaroni in Italian dressing for 2 to 3 hours or overnight. Mix sour cream, mayonnaise, onion, celery, garlic powder, tuna, and salt and pepper into macaroni. Chill.