Former royal chef Carolyn Robb revealed Prince William and his younger brother Prince Harry have had a sweet tooth since childhood as she discussed her working days in the service of Princess Diana The Duke of Cambridge’s favourite dessert was revealed to be a rich chocolate cake the whole Royal Family is believed to be a fan of Royal commentator Angela Morland told the This Morning Show: “Carolyn has come out and given this interview on what it was like working for them How Princess Diana BROKE Royal protocol in EXPLOSIVE interview How Princess Diana tried to DEPRIVE Charles of his right to the throne  “Diana, according to Carolyn, used to come and sit in the kitchen, she would help with the dishes  “She was happy with Prince William – he loves chocolate biscuit cake.” Ms Morland also discussed further details of Ms Robb’s revelations about her time at Kensington Palace: “One of the anecdotes she talks about is, Harry when he was a boy, coming into the kitchen before breakfast wanting treacle tart  “He came in saying he wanted treacle tart and she sent him off to get his mum’s permission Diana wrote this adorable note that says, ‘Mummy says it’s ok!’ READ MORE: How Princess Diana tried to DEPRIVE Prince Charles of his right to the throne – ‘Madness’  “He went back to the kitchen and she made him a treacle tart for breakfast It’s a really sweet story. It’s such a snapshot of the mother she was.” Ms Robb, who went on to work for Prince Charles following the death of Diana, also claimed the Prince of Wales was a more stringent employee compared to his late ex-wife as he was more specific about the food served in his home  Ms Morland added: “Carolyn then went, after Diana’s death, to work for Charles. She said she could never serve asparagus out of season  “He would get very cross if you served asparagus when they were not in season. So Diana a bit more relaxed, him a bit more uptight ” Ms Robb was the first female chef employed by Charles and remembers being interviewed for the post by Diana who “came into the kitchen, kicked off her shoes — there was lots of laughing and joking, which was so typical of her” REVEALED: Princess Diana gave Palace THIS Prince William ‘ultimatum’ How Princess Diana will ALWAYS ‘influence’ Prince William and Harry  Diana was “very easy to cook for and loved simple things: cold minted lamb, salads, soufflés, stuffed aubergine”  Charles, however, could be more demanding: “Everything was based on what was in season in the garden…you wouldn’t dare serve asparagus in December ” Ms Robb was with the family when Charles and Diana’s marriage broke down, and developed a close relationship with the children  She said: “It was a tricky time. I wanted to do whatever I could to contribute any small comfort  “Just to be there in the kitchen when the boys would come in and out. “We’d chat, have fun, and I would make special treats for them ” When the boys went off to Eton, they relied on Ms Robb as a source of inspiration as they learned to cook for themselves