French Meat and Beans Stew

Name: French Meat and Beans Stew
Cuisine: European, Mediterranean, French
Ingredients: 400g dried white beans (such as cannellini or Tarbais beans); 2 duck confit legs; 200g pork shoulder, cut into chunks; 100g pork sausage, cut into pieces; 100g pancetta or unsmoked bacon lardons; 1 large onion, chopped; 3 cloves garlic, minced; 1 medium carrot, chopped; 1 bouquet garni (parsley, thyme, and bay leaf tied together); 4 ripe tomatoes, chopped (or 1 can of crushed tomatoes); 1 litre chicken or beef stock; 1 tbsp tomato paste; Salt and black pepper to taste; 100g breadcrumbs (optional, for topping); 2 tbsp duck fat (or olive oil if unavailable)