Valeries Comfy Cassoulet

Name: Valerie's Comfy Cassoulet
Ingredients: 1 pound dried Great Northern beans; Kosher salt and freshly ground black pepper; Extra-virgin olive oil; 12 ounces slab bacon, cut into 1/2-inch lardons; 1 pound Bratwurst sausage or fresh Polish sausage (4 to 5 links); 1 1/2 pounds bone-in, skin-on chicken thighs; 1 pound chicken drumsticks; 1 cup finely chopped yellow onions; 1 cup thinly sliced carrots; 1/2 cup finely chopped fennel, fronds reserved for garnish; 1/2 cup finely chopped celery; 2 tablespoons thinly sliced garlic; 2 tablespoons tomato paste; One 14-ounce can diced tomatoes in tomato juice; 1 1/2 cups unsalted chicken stock; 2 tablespoons roughly chopped fresh Italian parsley; 1 tablespoon roughly chopped fresh rosemary; 1 tablespoon fresh thyme leaves; 1 tablespoon unsalted butter; 2 cups fresh breadcrumbs; Kosher salt; 1 lemon, zested; 1 tablespoon roughly chopped fresh parsley