@darius I'm not sure there IS a universal for that in the US.

I see meatloaf but I more strongly associate that with Gen-X. Personal bias in that I've always hated the stuff tho, and stopped eating it the minute I had a choice.

Everything else I can think of that I've seen as a staple is regional/cultural, and that stuff gets passed down. The coasts will never stop having seafood, the deep south will never stop having barbecue, the SW will never stop having Tex-Mex, etc.