How to Make It
Combine the rums, simple syrup, and lime juice in a cocktail shaker. Fill with ice; cover with lid, and shake vigorously 30 seconds. Place frozen ice cone, pointing up, in a chilled rocks glass. Strain drink mixture over frozen ice cone or crushed ice.
For ice cone: Firmly pack finely crushed ice into the bottom half of a 7-ounce plastic-lined paper cone. Pour in just enough water to cover ice. Place, upright, in a narrow freezer-safe glass, and freeze until completely firm, about 8 hours. Tear paper from frozen ice cone and use immediately.
Beach Cocktails: Favorite Surfside Sips and Bar Snacks (© 2017 Time Inc. Books)