Cauliflower Mac ‘n’ Cheese with Crispy Bacon Crumbs

This recipe is born of a cauliflower mac and cheese that I conceived for a major high-street fast-food chain a few years ago. I was standing in their head office, meeting a friend who did consultancy work there, and thinking aloud, I suggested a cauliflower mac ‘n’ cheese for their new menu. A few weeks later, it was one of their most successful ever launches of a new product, and at the time of writing, four years later, it is still on the menu. I should have asked for commission, but I ta