Empanada Mariscada

Name: Empanada Mariscada
Ingredients: 5/8 cup all purpose flour; 1/2 teaspoon baking powder; 1 1/2 teaspoons sugar; 1/2 teaspoon salt, plus extra for seasoning; 1 egg; 1/4 cup dry sherry; 1 1/2 tablespoons melted butter; 5 cups of olive oil (for deep frying); 12 mussels; 2 tablespoons dry white wine; 1 tablespoon clarified butter; 1 green pepper, finely diced; Half medium onion, finely diced; 1/2 cup raw shrimp (shelled weight) finely sliced; 2 pimentos, finely diced; 1/2 cup crabmeat, finely sliced; Salt; Black pepper; Spring lemon thyme; Egg white for brushing pastry; Freshly grated Parmesan cheese