The Boston Cooler is a classic cocktail made of rum, simple syrup and lemon juice, served over ice with gin. It contains no citrus juices and has a slightly more bitter taste than the gin-based version. The name "Boston Cooler" has a convoluted history that goes back to at least 1889. The drink's composition and preparation went through several variations before settling on the Vernors and vanilla ice cream combination that we know today.
The word "Boston Cooler" first appeared in print in a Sunday edition of the St. Louis Post-Dispatch, in an article titled "Latest Summer Drinks," in which a New York-based bartender says he created the phrase while preparing a drink of sarsaparilla and ginger ale. In the early 1900s, a few firms used the brand for their own beverages.
2 ounce Light Rum
1 ounce Fresh lemon juice
2 tsp Simple Syrup
Soda water or ginger ale
Orange or lemon zest spiral
1. Stir rum, lemon juice, and syrup in Collins glass. Add ice, fill with soda water or ginger ale, and stir again.
2. Add citrus spiral and dangle end over glass rim.
3. Serve in a Collins Glass.