Creamy Crab Chowder

Name: Creamy Crab Chowder
Ingredients: 2 tablespoons bacon grease; 2 tablespoons butter; 1 onion, finely chopped; 1 stalk celery, finely chopped; 1 tablespoon chopped fresh parsley; 1.5 cups chicken stock; 1 quart heavy cream; 0.5 teaspoon salt; 0.5 teaspoon seasoned salt; 0.125 teaspoon ground black pepper; 0.125 teaspoon chili powder; 0.125 teaspoon dried dill weed; 1 pinch white sugar; 1 pinch cayenne pepper; 1 pound fresh crabmeat; 2 tablespoons all-purpose flour; 1 tablespoon water, or as needed; 0.25 cup dry sherry