Holding the highest royal title in Britain has its perks. When she’s not wining and dining with world leaders and pop stars, the 90-year-old Queen of England likes to treat herself to her favorite snacks. According to her longtime chef, there’s one cake in particular that occupies a special place on her menu.

In an interview with RecipesPlus, Royal Chef Darren McGrady shared his intimate knowledge of the Queen, gained over 15 years of cooking for the Royal Family. One noteworthy dining habit of hers involves an irresistible chocolate biscuit cake.

The cake is one of several that are baked for the Queen on a regular basis. While the Queen usually ends up sampling just a slice of most, with the rest going to her staff, the chocolate biscuit cake is a different story. McGrady told RecipesPlus:

"Now the chocolate biscuit cake is the only cake that goes back again and again and again every day until it's all gone […] She'll take a small slice every day until eventually there is only one tiny piece, but you have to send that up, she wants to finish the whole of that cake."

The Queen is so partial to the dessert that she brings it with her wherever she goes. On days when she travels to Windsor Castle, whatever chocolate cake is leftover at Buckingham Palace is loaded aboard the train.

Her Majesty has a notorious sweet tooth. When she isn’t indulging it with chocolate, she enjoys fresh fruits like mangoes and citrus. The Queen can also be picky when it comes to her treats. According to an interview with another former royal chef, she’s not a fan of lumpy custard.

[h/t RecipesPlus]