Apparently, the two enjoy mushroom foraging and are "deeply competitive about their hauls," the food writer writes. In the book, as reported by the Daily Mail, Barker Bowles says mushrooms are "somewhat of an obsession" for King Charles and Queen Camilla — the pair even try to out-forage each other.

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Queen Camilla's son Tom Parker Bowles spoke about King Charles' health amid his cancer treatment in a new interview with British Vogue.