Apple Cider Sauce
Boil cider in a small heavy saucepan over high heat until reduced to 1 cup, 15 to 20 minutes.Advertisement
Mix cornstarch and water; add to the cider and cook, stirring, until slightly thickened, about 1 minute. Remove from heat and swirl in butter until melted. Serve warm or chilled.
Make Ahead Tip: The sauce will keep, covered, in the refrigerator for up to 4 days.