This Mash-Topped Beef & Guinness Pie is a hearty and comforting dish that combines tender beef, rich Guinness beer, and a creamy mashed potato topping. The beef is slow-cooked in a savory Guinness gravy until it becomes melt-in-your-mouth tender. The pie is then topped with a layer of creamy mashed potatoes and baked until golden and bubbling. This dish is perfect for a cozy dinner on a cold evening.