Jamaican Bok Choy

Heat the oil in a large enameled casserole or a large wok. Add the bok choy and stir-fry over moderately high heat until starting to wilt, about 3 minutes. Add the garlic and chile and cook, stirring, until the garlic is fragrant, about 1 minute. Stir in the butter. Season with salt and pepper and serve at once.