Begin by marinating the cooked shrimp in a bowl with lemon juice, olive oil, garlic, and cumin for about 10 minutes.

Heat a non-stick skillet over medium heat and add the marinated shrimp. Sauté for approximately 5 minutes, stirring occasionally, until the shrimp turn pink and opaque.

In a mixing bowl, combine sour cream, mayonnaise, Worcestershire sauce, brown sugar, mustard powder, granulated garlic, salt, and pepper. Whisk thoroughly until the mixture is smooth and creamy.

In a large mixing bowl, add the cooked macaroni, sautéed shrimp, chopped shallot, diced celery, and parsley. Gently toss the ingredients together.

Pour the prepared dressing over the pasta and shrimp mixture. Carefully toss everything together until well coated.

Cover the salad with plastic wrap and refrigerate for at least 30 minutes.