[header] How to reheat a roast [title] Save the drippings from the roast when you first cook it. [step] If you want to reheat a roast for later, the process starts when you first cook the roast. Roasts can dry out in the reheating process, so you'll want to save any fats or fluids that drip off the roast into the baking pan. 
[substeps] You should also cook the roast slightly less done than you prefer. For example, if you prefer a medium rare roast, remove your roast from the oven when it's rare.