Swizzle all except garnishes with crushed ice. Garnish and serve with straw.
Not as intense in flavor as an actual (Improved) Chartreuse Swizzle, but the format still fits Cocalero Clásico (green Coca leaf liqueur) quite well. If you like one, you'll probably like the other.
I'd been looking for a decent use of my long neglected bottle of Cocalero. After trying the Improved Chartreuse Swizzle, I realized that a larger amount of Overproof Rum might balance out the substitution of the weaker (but still decidedly green) Cocalero in place of Chartreuse.
Named for the drink being able to visually pass for its original inspiration while using a less distinguished base ingredient. Also, CHARlatan/CHARtreuse.
Adapted from http://www.kaiserpenguin.com/improved-chartreuse-swizzle/, which was already posted here: https://kindredcocktails.com/cocktail/improved-chartreuse-swizzle