This perfect roast beef with demi glace sauce is a classic and elegant dish that is sure to impress. The beef is cooked to perfection, with a juicy and tender interior and a beautifully caramelized crust. The demi glace sauce adds a rich and flavorful element to the dish, complementing the beef perfectly. Serve this roast beef with creamy mashed potatoes and roasted vegetables for a complete and delicious meal.