Walking past a Pret A Manger the other day, I saw them offering a Dubai-style hot chocolate, a latte version, and even a dessert. It’s the food-and-drink trend that’s taken over the planet. Over the past 18 to 24 months, there’s been a proliferation of Dubai chocolate, with this bar and its eye-catching green hues appearing everywhere, from your social media feed to the chocolate counter by the till at the garage and on menus across the world. D…