"It’s so hard cooking curry with the family though. The children have a portion with no spice, yours is medium,” Kate said to William. "And I quite like it hot." before adding: "Charlotte is pretty good with heat."
Kate has previously stated she is a fan of spicy food ahead of the Cambridge's royal tour to India in 2016, but William admitted that he "struggles" with spice.
"Me and heat not so good," he said. "I love spice but not heat."
WATCH: Charlotte's favourite show revealed as William receives odd toy
Earlier this month, Prince William revealed Princess Charlotte's favourite TV show, and it's not what you might expect!
The Duke of Cambridge was at BAFTA HQ in London to launch a new exhibition called Behind the Screens, which is a celebration of 75 years of the UK film and television industry.
During his visit, the Duke was gifted with a toy Clanger, from the recently relaunched TV show of the same name.
Daily Mirror's royal editor Russell Myers explained the toy had been given to Charlotte, as she's said to be a fan of the kids TV show.
"I’m told Princess Charlotte is a big fan of the Clangers so Prince William was presented with a little Clangers toy."
Adding that Prince William admitted he'd "dropped a few clangers in his time" upon receiving the thoughtful present.