Is there a *particular* “traditional Christmas sweet, cherished for generations” that he fears will be mishandled by American adaptation? And he doesn’t name it? Are we supposed to be able to figure it out; or is it just generalized and hypothetical?
Originally picked up from GoComics, but phsiiicidu was able to locate it at SMBC’s own site. So we can report on the rollover text, as there are those who think an SMBC is incomplete without it. But here it seems to offer nothing to solve those doubts. “One day, molecular printers will allow starbucks to serve every conceivable food as a whipped topping.”
Comics I Don't Understand 
My current guesses are “frappé“, “crème brûlée“, and “brioche“, but I expect that one or two of them will turn out to be wrong.
I’m guessing it’s “generalized and hypothetical” as I can’t come up with anything obvious. (And none of Kilby’s suggestions are “traditional Christmas sweets”.)
Or it’s sort of like the old SNL “It’s a dessert topping–and a floor wax!” IOW, we’ll take your national dish and do what we damned well please with it.
@ Powers – I have no idea why I decided that the source nation should be France, there’s nothing in the comic to indicate that. It probably could be any western European nation, including the U.K.
Sure, but when in doubt, pick on the French, eh? (channeling my Ontario upbringing!)
If it’s fruitcake, then I’m behind America 100%!
It looks a bit like Christmas Pudding, a British treat somewhere between fruitcake & road apples
https://theconversation.com/a-brief-history-of-christmas-pudding-and-why-it-can-actually-be-quite-good-for-you-151160#:~:text=A%20Christmas%20pudding%20should%20have,%2C%20eggs%2C%20milk%20and%20brandy.
Egg nog? (Nogg?)
I’ll wait patiently for that lutefisk milkshake.
Pumpkin Spice? I looked up “coffee flavors” and found that there are a surprising number of flavors available, such as pecan, caramel and butterscotch, but didn’t find any that suggested some other country’s Christmas treat. Maybe marzipan? Is that mainly a Christmas thing somewhere? But for a coffee flavor we would call that “amaretto”.
I was thinking along the line of Cadbury after it was bought out by Hershey.
Another guess, this time based on the color of the stuff in the mixer: (British) “plum pudding”.
Gingerbread?
Harvling: probably Lebkuchen, which is a traditional Christmas treat in Germany and is similar to gingerbread. This link gives links to recipes for Lebkuchen Latte and Lebkuchen Milkshake, and if you’re not careful, Lebkuchen Braised Beef Short Ribs. https://rawspicebar.com/blogs/spices-101/the-many-ways-to-enjoy-lebkuchen
MiB has solved the puzzle!