16 heads of baby bok choy, trimmed, or 4 pounds large bok choy, leaves and
upper stems only, cut into 2-inch pieces
2 garlic cloves, minced
1 to 2 teaspoons seeded minced Scotch bonnet chile
1 tablespoon unsalted butter
Salt and freshly ground pepper
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.