We use leftovers for beef pot pie or cottage pie, or for sammies as BT suggested. Thanks folks. Slice it thin for sandwiches (there’s nothing better than a roast beef sandwich with gravy poured over it) or slice it thick for breakfast steak and eggs. You can also cube or chop some for a beef and cheese omelette.Click to see full answer. Subsequently, one may also ask, how do you reheat Chateaubriand?Reheat it gently in your oven at 225 degrees Fahrenheit until its internal temperature reaches at least 150 F, then remove and slice it. Alternatively, if the beef is tightly sealed in waterproof packaging, you can heat it slowly in a pot of simmering water.Likewise, can you freeze Chateaubriand? Place the container of beef in the freezer to freeze the tenderloin as quickly as possible. Frozen beef tenderloin is best if it is thawed and consumed after no more than two weeks in the freezer. While you can still eat it after three to four weeks, it is at its best under two. Moreover, what can I make with leftover filet mignon? 11 Ideas for Leftover Beef Tenderloin or Prime Rib Peruvian Quinoa Bowl. Korean-Style Spicy Beef Lettuce Wraps. Beef Tenderloin with Cool Horseradish-Dill Sauce. Beef Stroganoff. Faux Phõ Beef and Arugula Salad with White Beans and Shiitake. Thai Red Curry with Beef and Kabocha Squash. Prime Rib Sandwich with Roasted-Garlic Dijonnaise. How do you eat leftover steak? 15 Ways to Use Leftover Grilled Steak 1 of 15. Texas Eggs Benedict. 2 of 15. Tacos Carne Asada. 3 of 15. Sweet Potato Toast with Steak, Roasted Peppers and Arugula. 4 of 15. Philly Cheese Steak. 5 of 15. Sweet Chili Grilled Steak on Artichoke & Radicchio Salad. 6 of 15. Ricardo’s Beef and Bell Pepper Grilled Pizza. 7 of 15. 8 of 15.