When it’s too cold to grill outside, you can mimic the flavor of barbecued chicken with your oven broiler. Between the smoky spice rub and the sweet-hot barbecue sauce, you’ll never miss the grill. Serves 4 For the sauce 1/2 cup ketchup 1/3 cup pure maple syrup 2 Tbs. mild unsulfured molasses 2 Tbs. cider…