Yes, you can freeze the leftovers or make a double batch to freeze half for later! Just make sure to cool the cooked steaks and gravy to room temperature. Then, transfer it all into an airtight freezer container with a lid. Get as much air out as you can, label, and freeze for up to 2 months. To thaw, it's best to slow-thaw it in the refrigerator overnight or for up to 24 hours. Reheat them in a pan over medium to medium-low heat.