In a bowl, mix shrimp with lemon juice, olive oil, ½ tsp granulated garlic, and ⅓ tsp cumin. Let it sit for about 10 minutes while you prep everything else.
Sauté the shrimp over medium heat for about 5 minutes. Stir as it cooks, then transfer it to a plate to cool.
In a separate bowl, mix together the sour cream, mayonnaise, Worcestershire sauce, brown sugar, mustard powder, salt, pepper, granulated garlic, and cumin. Stir until smooth.
In a large bowl, combine the cooked macaroni, shrimp, chopped shallot, celery, and parsley. Pour the dressing over the top and mix until everything is well coated.
Refrigerate the salad for about 30 minutes to let the flavors come together. Serve cold.