The braised bacon and the reduced braising liquid can be refrigerated, separately, up to one day. Let the bacon stand at room temperature one hour, and reheat glaze to warm before caramelizing the bacon.
Reducing the grapefruit juice concentrates the flavor in the curd. You will need only part of it for the jasmine shortbread cookies, but you'll find plenty of ways to use up the remainder. Serve it with scones, biscuits, or pancakes; lighten it with whipped cream and fill tartlet shells; or dip cookies in it.