When Prince William paused to greet three-year-old Willow during a visit to the Royal Cornwall Show, her family never expected a gift to exchange hands.
They were taken aback when Willow reached up with a single Quaver – and even more surprised when the prince popped the savoury snack into his jacket pocket.
"I don't think I've ever been offered a Quaver before," the prince said. "I'm going to save this and put it in my pocket for later."
Grandmother Sharon Hart, who captured the moment on video, told the BBC: "It was a lovely genuine moment and a memory that we will never forget."
Ms Hart, from Luxulyan, Cornwall, said: "I guess he gets some very expensive presents and this was a first.
"Willow always wants to be a princess, so the fact she met a real live prince – she thought that was incredible."
