Prince William and Prince Harry’s former royal chef, Darren McGrady, recently opened up about the siblings’ eating habits when they were still kids.

As young boys, Prince William and Prince Harry were like any other kids who preferred to eat peanut butter and jelly instead of veggies. It was their late mom, Princess Diana, who introduced them to the sweet treat during one of their trips to Disneyland.

While speaking with Today, McGrady said that as the royal family’s chef, it became his responsibility to encourage Prince William and Prince Harry to eat vegetables.

At a young age, the royal kids’ nannies are the ones who feed them a wide array of food while at the nursery. “The royal nursery wasn’t just for educating the minds of the young royals, but educating their palates, too. Nanny always had control of the menu and made sure they ate balanced meals that included not only lots of healthy vegetables but introduced them to grown up dishes too,” he said.

McGrady, who is officially dubbed as The Royal Chef, also revealed that Princess Diana made sure her kids would eat the same food that the adults were eating. And since children are inquisitive, the minute they see their parents eating the same food, they just dug in themselves.

The former royal chef also suggested that “scary vegetables” be mixed with mashed potatoes so that the kids can get more nutrients. He is also vouching for bubble and squeak.

“Bubble and squeak is one of our national treasures. It was a way of using up leftover roast dinner but also as a nursery food to nourish the children by hiding gross vegetables like cabbage,” he said.

Meanwhile, Prince William and Prince Harry’s meals are more relaxed on weekends. While learning how to play tennis, the brothers can get a muffin at the court. And because they loved peanut butter and jelly too much, McGrady baked peanut butter and jelly muffin for them.

And whenever the brothers were alone with their mom, they got to eat whatever they requested from her. “The princess wanted the boys to be happy,” he said.