The phrase, widely known in the UK thanks to The Great British Bake Off, refers to undercooked pastry. It also uses the word “bottom” in a way that isn’t as common in American English, which may explain the brief moment of confusion.

A Historic Address
Later that day, King Charles made history by addressing the U.S. Congress, becoming only the second British monarch to do so after Queen Elizabeth II.
In his speech, he reflected on shared democratic values between the two nations, saying: “Distinguished members of the 119th Congress, it is here in these very halls that this spirit of liberty and the promise of America’s Founders is present in every session and every vote cast.”
“Not by the will of one, but by the deliberation of many, representing the living mosaic of the United States.”
He continued: “In both of our countries, it is the very fact of our vibrant, diverse and free societies that gives us our collective strength, including to support victims of some of the ills that, so tragically, exist in both our societies today.”