Boston Cooler

Pro tips

• Dissolve powdered sugar in the lemon juice and rum before adding carbonated liquid to ensure even sweetness and prevent grittiness.
• Add club soda or ginger ale last and stir gently to preserve carbonation and fizziness.
• Chill your glass with ice before pouring to keep the drink cold longer without excessive dilution.
• Taste and adjust lemon or sugar to your preference—some prefer it tarter, others sweeter.

Substitutions

• Light rum → dark rum (adds deeper molasses notes, changes color and flavor profile)
• Club soda → ginger ale (adds spice and sweetness)
• Powdered sugar → simple syrup (use ½–¾ tsp for easier mixing, no grittiness)

Storage & make-ahead

Serve immediately after preparing. Pre-mix the rum, lemon juice, and sugar up to 2 hours ahead, then add carbonation and ice just before serving.

Can I use fresh lemon juice instead of bottled?

Yes, fresh lemon juice is preferred and will give you a brighter, more authentic flavor than bottled juice.

What's the difference between using club soda and ginger ale?

Club soda keeps the drink crisp and neutral, while ginger ale adds subtle spice and sweetness. Choose based on your preference.

Can I make a batch of Boston Coolers ahead?

Mix the rum, lemon juice, and powdered sugar ahead, then add club soda or ginger ale and ice just before serving to maintain carbonation.

What type of rum works best?

Light or white rum is traditional for this cocktail, though aged rum can work if you prefer deeper flavor.

How do I dissolve the powdered sugar evenly?

Stir the powdered sugar with the lemon juice and rum first, then add the club soda last to avoid over-mixing and losing carbonation.