Ingredient:

• 1 onion, peeled and cut into chunks
• 1 parsley root, peeled and cut into chunks
• 1 carrot, roughly chopped
• 1 sprig fresh rosemary
• 2 bay leaves
• 1 teaspoon whole white peppercorns
• 2 cups dry white wine
• 1 whole duck
• 2 cups finely chopped roasted chestnuts
• 1 apple, peeled and finely chopped
• 2 slices bread, diced
• 1 egg
• 1 teaspoon dried tarragon, or to taste
• salt and freshly ground pepper to taste
• wooden skewers
• 2 tablespoons rapeseed oil, or more if needed