Brown Bread Stuffing With Chestnuts, Apples, And Sausage

Ingredients

• 1/4 cup duck fat or unsalted butter (1/2 stick), plus more for coating the baking dish
• 6 slices pumpernickel or dark rye bread (about 1/2 loaf), crusts removed, medium dice
• 6 slices wheat bread (about 1/2 loaf), crusts removed, medium dice
• 5 sweet italian sausages (about 1 pound), casings removed
• 1 medium yellow onion, medium dice
• 1/4 cup torn fresh sage leaves
• 1 tablespoon finely chopped thyme leaves
• 1 tablespoon finely chopped italian parsley leaves
• 2 medium celery stalks, medium dice
• 1 teaspoon celery seed (optional)
• 2 medium granny smith apples, peeled and cored, medium dice
• 1 cup coarsely chopped steamed or roasted chestnuts
• 1 cup low-sodium chicken broth
• salt
• freshly ground black pepper