Once a humble diner staple, the smash burger has taken the food world by storm in recent years, evolving from a regional favourite into a worldwide obsession. With its thin, crispy-edged patties, seared to perfection on a hot griddle, the smash burger offers an irresistible combination of flavour and texture. This must-have menu item has a long history of delighting hungry customers, first cropping up on the burger scene in the 1930s. So why is it only now having its moment in the sun?