Macaroni and IPA cheese sauce - though whether mac and cheese is thanksgiving fair depends on what part of the country you're from.
I'm not so sure about IPA sauce. I love IPAs but not for cooking. This does bring up an interesting idea though. Has anyone ever used a little beer in the sauce instead of milk just to add that flavor? I would think you'd want to add just a little at the very end to avoid any clumping. I have some porter in the basement that might go pretty well in the cheese sauce.
Many brewpubs sell beer-cheese soup and there are cheese fondue recipes made with beer, so I imagined you just make a thick version and add macaroni - done. The beer-cheese soups are often made with IPA's, though perhaps just a bit so they can call it IPA soup. I usually don't like hop flavor in my food.