Last night I bought & heated a 5 lb precooked prime rib from Costco. I followed the instructions (400 for 1.5 hours) for a medium rare and it came out pretty good. Tender, but just a bit overdone.
Since there were only two of us at dinner we ate slightly less than half of it. Today I want to reheat it without really cooking it too much more.
What's the best way of doing this?