As a genuine answer to the foods that non-Americans just wouldn't get, mostly due to their cultural history tied in to both the meals and the prep
>Thanksgiving Turkey
>The 9999 localized pie variants (especially apple and pumpkin)
>Greasy burgers n fries from the local shack
>American pizza and the constant feud over its variants
>Applejack
>Moonshine
>Bold California Red Wine
>County Fair fried oreos, funnel cakes, and lemonade

The biggest difference in food is the breakfasts though. Every culture does them differently, but no one does breakfasts like America. The big breakfast spreads, shrimp n grits, donuts n coffee, hash, ect. England has the English breakfasts, but for the rest of the world that understands that black pudding is not fit for human consumption, and beans are not meant to be combined with slices of bread, it falls short. France has a pretty good breakfast, but its largely just pastries, or eggs prepared in one specific (albeit good) way. Traveling overseas is great for trying new foods, but Americans breakfasts are always what I find myself missing the most.