Between writing about the new marketing push for Kraft Singles [1] and Bobby Flay offering sandwich-making tips [2], I've had grilled cheese on the brain. I'm a particularly huge fan of Hog Island's version [3], as well as Party's rendition with taleggio, escarole, and onion jam [4]. Today, I'm making a variation based on ingredients I have on hand: sweet butter, aged gruyere, and artisan Pugliese bread. What's your perfect combination?