Last year M&S's chunky chocolate bar known as the Big Daddy, which is filled with caramel, peanut butter and roasted peanut pieces, went viral, with many people hailing it the UK's answer to the Dubai chocolate bar. The Dubai chocolate is a chocolate bar made with pistachio and kadayif, a thin shredded filo pastry.

Dubai chocolate, featuring pistachio cream and crunchy phyllo dough, has taken off in Kansas City. Find it in everything from bars to brownies at bakeries, sweet shops and specialty markets.

It’s easy to see why the treat has become a worldwide obsession: It takes a thick chocolate bar and fills it with pistachio cream and kataifi (shredded bits of toasted phyllo do