Traditional French Cassoulet Recipe

Name: Traditional French Cassoulet Recipe
Ingredients: 1 pound dried cannellini beans; Kosher salt; 1 quart homemade or store-bought low-sodium chicken stock; 3 packets (3/4 ounces) unflavored gelatin (see note above); 2 tablespoons duck fat (optional); 8 ounces salt pork, cut into 3/4-inch cubes; 6 to 8 pieces of chicken thighs and drumsticks, or 4 whole chicken leg quarters; Freshly ground black pepper; 1 pound garlic sausage (2 to 4 links depending on size); 1 large onion, finely diced (about 1 cup); 1 carrot, unpeeled, cut into 3-inch sections; 2 stalks celery, cut into 3-inch sections; 1 whole head garlic; 4 sprigs parsley; 2 bay leaves; 6 cloves