Princess Diana nearly burned the Kensington Palace down, revealed former royal chef Darren McGrady.

Having worked in the royal kitchen for 15 years, McGrady was tasked on the day-to-day menus in the palace -- from Princes Harry and William to the Duke of Edinburgh and even up to the Queen herself. However, among all the members of the Royal Family, the chef held the People's Princess closest to his heart.

After cooking for the Queen for over a decade, McGrady moved to Kensington Palace in 1993 as the private chef to Princess Diana, for whom he worked Monday to Friday.

"The Princess was the worst cook ever," McGrady exclaimed in an interview with The Morning Show.

McGrady then recalled the memory of a weekend when the Princess almost set the palace pantry on fire.

After inviting a friend over, the Princess had decided to cook pasta and a tomato sauce. She was carried away, however, with having a conversation with her guest. The pasta boiled all over and eventually put out the pilot light. When the Princess returned to the kitchen, she could smell gas -- forcing her to call the Palace's fire brigade.

The following Monday morning, Princess Diana came to McGrady to narrate the incident. Amusingly, the late Princess found a positive from the incident, telling the then royal chef that having "12 hunky firemen" for herself was the best part of it.

Having spent a considerable part of his life within the Palace, McGrady had also become a regular in the kitchen for the young Princes William and Harry. He said that he used to feed them both with purees before their preferences shifted to hotdogs, burgers, fried chickens and cottage pies.

McGrady also disclosed that there had always been battles between the young princes and their nanny about having their green vegetables.

The chef told Marie Claire that there was a day when Princess Diana ordered him to cancel lunch for the boys, as she would take them out to McDonalds. When McBrady tried to stop her by saying he himself could do burgers, the princess answered: "No, it's the toy they want."

This isn't the first time McGrady shared insider details from the royal kitchen. In a previous interview with CNN, the  chef revealed that Her Majesty is simply the kind of person who eats to live rather than living to eat.

After the fateful 1997 incident that took the life of Princess Diana, McGrady decided to hang his royal apron. He then started picking up his pen, laying his royal experiences into the pages of his own books.

The first issue was about his 15 years of serving the Royal Family. The chef donated all the royalties to the late Princess' charity. His second book, "The Royal Chef at Home," narrated his 20-year stay in the U.S., and how he moved from the Palace to Dallas.