Heat a cast-iron skillet over medium heat, then add the olive oil. When that’s shimmery and hot, add the tomatoes and shake the pan so they shuffle into a single layer. Sprinkle generously with salt and pepper and let them sizzle for about 3 minutes, or until they’re tender and starting to brown on the bottom. Use a wooden spoon or spatula to shuffle the tomatoes around, then cover completely with the grated cheese. As soon as most of it has melted, cut the heat. Serve straight out of the skillet with something starchy for soaking up the cheesy-tomatoey sauce.