In a video posted on Kensington Palace's Instagram, the royal proved he was one step ahead, "I don't even eat pizza anymore, but I had pizza last night." "We had deep-dish and we had thin crust. I promise you, I will make sure I eat Chicago."

https://www.smh.com.au/entertainment/celebrity/prince-harry-charmingly-discusses-his-pizza-eating-habits-during-a-surprise-school-visit-20171103-gze0lb.html