Smoked Goose and Foie Gras Gumbo

Name: Smoked Goose and Foie Gras Gumbo
Ingredients: 1 cup rendered goose fat; 1 cup flour; 5 cloves garlic, minced; 3 stalks celery, minced; 1 green bell pepper, minced; 1 large yellow onion, minced; 1 lb. white button mushrooms, minced; 2 tsp. kosher salt, plus more to taste; 1 tsp. Creole seasoning; 1⁄2 tsp. freshly ground black pepper; 2 bay leaves; 10 cups chicken stock; 12 oz. smoked goose, roughly chopped; 1 lb. chanterelle, porcini, or oyster mushrooms, cut into 1″ pieces; 1 tsp. hot sauce; 1 tsp. Worcestershire sauce; 1⁄2 tsp. minced thyme; 3 oz. foie gras, puréed; Sliced scallions, for garnish; Cooked white rice, for serving