Name: Champ-Topped Vegetable Beef Guinness Casserole
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Yield: 4 to 6 servings
Ingredients: 1½ tablespoons olive oil; 1 lb (450 g) lean ground beef; 8 oz (225 g) cremini mushrooms, quartered; 3 medium carrots, chopped; 2 large stalks celery, chopped; 2 medium parsnips, chopped; 1 large onion, chopped; 1 tablespoon minced fresh thyme; 1 teaspoon salt; ¼ teaspoon black pepper; 1 bay leaf; 1 cup (240 ml) Guinness Stout (see Note); 2 teaspoon Worcestershire sauce; 1 tablespoon arrowroot starch (or cornstarch), dissolved in 1 tablespoon cold water; 1½ lbs (680 g or about 3 medium-large) starchy potatoes, such as Russet, peeled and cubed; 4 tablespoons unsalted butter; ½ cup (120 ml) half and half (or milk); ¾ teaspoon salt; ¼ teaspoon black pepper; 6 scallions, white and green parts, thinly sliced, divided; Butter, to grease the dish