Traditional Welsh Cawl Stew

Name: Traditional Welsh Cawl Stew
Prep time: 15 min
Cook time: 2 h 40 min
Total time: 2 h 55 min
Cuisine: British
Ingredients: 1 tablespoon lard, or bacon fat; 2 large onions, thickly sliced; 1 medium rutabaga , peeled and cut into 1-inch cubes; 4 large carrots, peeled and thickly sliced; 4 leeks , cleaned and sliced; 1 pound (450 grams) beef brisket; 1 pound (450 grams) smoked bacon, cut into 1-inch cubes; 1 bay leaf; 1 sprig fresh thyme; 1 pound (450 grams) potatoes, peeled and quartered; Salt, to taste; Freshly ground black pepper, to taste