A Boston Cooler is a light, citrus-forward rum cocktail combining Mr. Boston Rum, fresh lemon juice, powdered sugar, and carbonated water. It's an easy-to-make refresher ideal for warm weather entertaining.
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Into collins glass, put the lemon juice, powdered sugar, and carbonated water.
Then fill glass with cracked ice and add rum.
Fill with carbonated water or ginger ale and stir again.
Add spiral of orange or lemon peel (or both) and dangle end over rim of glass.
Boston Coolers are best served immediately after preparation and should not be stored, as carbonation will dissipate.
Carbonated water is essential for the drink's signature fizz and refreshing quality. Club soda or seltzer water are appropriate substitutes, but flat water will noticeably change the texture.
The recipe calls for Mr. Boston Rum, a light, neutral rum. Any light or white rum with similar proof and flavor profile will work as a substitute.
Fresh-squeezed lemon juice delivers better flavor and brightness. Bottled lemon juice contains preservatives that can dull the cocktail's taste.
The powdered sugar dissolves easily and provides balanced sweetness. Taste as you make it—add sugar gradually if you prefer less sweetness, or increase it slightly if the lemon is particularly tart.
