Add carrot and mushrooms. Pour over HEINZ [SERIOUSLY] GOOD™ Beef Casserole Simmer Sauce. Cover. Reduce heat to a simmer and cook for 1 ½ - 2 hours or until beef is tender. alternatively cook in a preheated 160°C oven for 1 ½ - 2hours until beef is tender. Serve with creamy mashed potatoes and your favourite green vegetables.