How to Make It
Combine first 6 ingredients in a blender, cover with lid, and process until smooth. Pour into 2 Collins glasses. Top off each with additional 1 1/2 teaspoons (1/4 ounce) black strap rum, if desired. Garnish, if desired.
Beach Cocktails: Favorite Surfside Sips and Bar Snacks (© 2017 Time Inc. Books)