Add sugared cranberries and a rosemary sprig to four martini glasses. Set the ornament in the glass to serve. Before drinking, slowly pour the contents of the ornament onto the cranberries.
These martinis do take a little longer to prepare, but they can be made in advance. Mix up the cocktails several hours before your party and portion them into the ornaments. Pop them in the refrigerator and pull them out when it’s serving time.