The British monarchy is well known for being a stickler for royal regulations, and those high expectations extend to the royal family’s offspring. According to The Mirror, former royal chef Darren McGrady, who previously worked for the late Queen Elizabeth II and Princess Diana, told Harper’s Bazaar that royal children such as Prince George, Princess Charlotte, and Prince Louis are not allowed to attend official dinners with their parents, including during the holidays, until “they have learned the art of polite conversation.”

Instead, royal children must have supper in the nursery with their nannies. “The children always ate in the nursery until they were old enough to conduct themselves properly at the dining table,” McGrady continued, adding that nannies play an essential part in teaching the royal children’s palates.

“The royal nursery was not only for educating the young royals’ minds but also for educating their palates,” McGrady recounted of his time working for the British royalty. “Nanny was always in charge of the menu and made sure they ate balanced meals that included not only lots of healthy vegetables but also introduced them to new adult dishes.”

McGrady previously disclosed to Bustle that Prince William and Harry inherited their mother’s sweet taste and had a particular fondness for banana flan and chocolate ice cream as children. “The boys were like bananas, and they loved bananas,” he remembered. “William loved the chocolate biscuit cake, which was also a favorite of the Queen.” At Buckingham Palace, we did it all the time.”

Meanwhile, McGrady revealed to Bustle that Princess Diana enjoyed a British chocolate classic and revealed the actual reason why the late princess disliked champagne and cocktails.