If I had to guess what it is, I'd guess it's some cheese. The greastest cultural divide between French food and Chinese palates has got to be weird rare stinky cheeses that the French covet but the Chinese think are disgusting. Macron probably had some shit that took 16 years to make that is teeming with maggots and odd coloured mould all over it, costs like 200 Euros a gram and only a single family in France has passed down the tradition of making this cheese, 1 wheel per month, enitrely by hand in a 600 year old barrel and he's smiling like the taste is going to send Xi and his wife into orgasm. Xi, however, took one bite and felt like someone had just put a used condom fermented for a month in a marathon runner's used sock into his mouth. Literally considered for a moment if this counts as an assassination attempt.
What was on the menu for the state banquet?