Say cheese: A guide to 5 iconic Mexican quesos and the regions that produce them

In Mexico, an endless debate spills across social media and enlists everyone from linguists and historians to cooks and passionate eaters: What belongs in a quesadilla? While cheese is an optional topping for many Mexican dishes — from tacos and tortas to chilaquiles and sopes — there is one contentious item that, depending on who you ask, is non-negotiable. From north to south, every region has…