Core the apples, and peel them if you like. (We prefer the added texture of the peels, but peeled apples look more sophisticated.) Cut the apples crosswise into ¼-inch-thick slices.
Melt about 2 tablespoons of the butter in a skillet over low heat and add a single layer of apple slices. Raise the heat to medium and sauté the slices, turning occasionally, until