The Queen has taken a trip out to the Irn-Bru factory in Cumbernauld for a taste of Scotland's sweet orange nectar.
The Duke of Cambridge accompanied his grandmother to AG Barr's factory this morning where they both officially opened the company's new process facility.
It was here that Prince William quenched his thirst with a sip of Irn-Bru and declared "you can taste the girders in it".
After touring the plant with the Queen, the duke was offered a drink and was asked by commercial director Jonathan Kemp if he had tried Irn Bru when he was a student at the University of St Andrews in Fife.
Sign up to Glasgow Live newsletters for more headlines straight to your inbox
"Not St Andrews," he replied, but added that Irn-Bru was often a part of lunches during his time in the armed forces, and after raising his glass and sipping he said it was "delicious".
William was intrigued when Colin Reilly, upstream manager, brought over a small jar containing the clear essence of Irn-Bru - with the recipe a secret only known to three people.
After taking a long sniff, the Duke said: "I'm trying to guess what's in it but that's quite hard, isn't it?"
Mr Reilly said: "I'd love to tell you," and William smiled as he replied: "This is a closely guarded secret."
Irn-Bru was launched in 1901 and has become a key brand in Scotland, rivalling whisky as the country's national tipple.
