Many women experience intense pregnancy cravings, but few turn them into a business that takes the world by storm. It was Sarah Hamouda’s hankering for knafeh, a Middle Eastern dessert her mother used to make,

This £10 chocolate bar has gained immense popularity in stores and online, prompting Waitrose to impose a limit on the number of bars that can be bought.

It’s the middle-class equivalent of the Prime energy drink craze: Waitrose is even limiting customers to two bars per person. Dubai style chocolate – with its pistachio, tahini and kadayif pastry (filo pastry made into fine strings and used in knafeh,