It's the quintessential comfort food. Loved by kids, sure, but never turned down by an adult. Warm and buttery, gooey but crisp with just the right amount of salty bite, a great grilled cheese sandwich is a symphony of tastes and textures. While the ingredients are pretty standard—you've likely got them in your fridge right now—it's the technique that makes a perfect grilled cheese. The secret is slathering the bread with ample butter, which crisps it in the pan and cooking it over low heat, which brings out the subtle flavors of the cheese. And of course, after plenty of our own in-house testing, we've determined that sandwiches sliced in half on a diagonal just taste better.