Despite the name, it has only a loose connection to Welsh rarebit — locals in the Nord adapted the cheese-and-beer toast into their own heartier, ham-topped version and simply kept the name.
Thick toast is topped with ham and a rich sauce of melted cheddar-style cheese whisked with local beer, then broiled until bubbling and often served over more toast with a fried egg and a side of fries. It's a staple lunch at estaminets throughout the Nord.