Seafood Salad Rolls

Name: Seafood Salad Rolls
Ingredients: 1 pound large shrimp, peeled and deveined, shells reserved; 1 tablespoon seafood seasoning, such as Old Bay; 10 fresh parsley stems with leaves; 10 black peppercorns; 1 rib celery, roughly chopped; 1 lemon, halved and juiced; 1/2 yellow onion; 1/2 cup mayonnaise; 2 tablespoons Dijon mustard; 1 tablespoon chopped fresh parsley; 1 teaspoon seafood seasoning, such as Old Bay; 1 teaspoon diced pimentos; 1 rib celery, thinly sliced; 1/2 red onion, finely diced; 8 ounces lump crab meat; 4 hot dog buns, buttered and toasted, for serving; Lemon wedges, for serving; Clarified butter, for serving