What is the best way to reheat some beef tenderloin?

Let it get to room temp on the counter and then sear it quickly in a non stick skillet making sure not to overcook it.

We usually cut it thin, put it in a pan with a little butter and reheat for paninis, poboys or hoagies. I usually put a little Cavendar's in the mix and sauteed onions.

If you're trying to eat it like a steak, I'd cut it in pretty thick slices, put some butter in a pretty hot pan and sear both cut sides. It will cook some more, but it won't be that overcooked if it was medium rare. I let it come to room temp first.

Chicken, I was gonna say "sit on it and don't let it hatch", but I thought about it and decided not to.

Eta:

The best way is to slice it thin, cover with cheddar and/or swiss cheese and heat it up in an oven, toaster oven, or microwave until the cheese melts. Serve on a toasted bun or white bread with a little mayo, Gueydens mustard, Tiger sauce and a fried egg.

Let it thaw and reach room temp, wrap loosely in foil and pour in just a little beef broth to keep it moist. Put it in the oven on 300 to 350 just to warm it up.

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We usually cut it thin, put it in a pan with a little butter and reheat for paninis, poboys or hoagies

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I usually do this. I've also sliced it thin, heat it up with some mushrooms and butter. Put all that on top of a baked potato.