Holiday Beef Tenderloin Dinner Add a rich stuffing to beef tenderloin, and you’ve got the ultimate main course, at least in theory. But making a tenderloin through can be a challenge—this is an expensive piece of meat, so you don’t want to risk ov... (more)ercooking it. We also wanted mashed potatoes so rich and decadent, not a drop of gravy would be necessary to enjoy them. Recipe: Roast Beef Tenderloin with Caramelized Onion and Mushroom Stuffing, Creamy Mashed Potatoes Equipment: Electric Knife Sharpeners