Add mint syrup, lime juice, rum, club soda and ice to a blender. Blend until smooth.
Add a handful of mint leaves. Pulse to break up the pieces. (If you over blend, the mixture will turn green.)
Pour into glasses and garnish with mint leaves, lime wedges and a straw.
Notes
Mint syrup recipe
In a medium saucepan over medium heat, combine ¾ cup sugar and ¾ cup water. Stir until sugar has dissolved. Do not let boil.
Remove from heat and add the mint sprigs. Let rest for 15 minutes, stirring occasionally. Leave in longer for a stronger flavor. Discard the mint leaves.
Store in a mason jar for up to one week.
Tips & tricks
Use fresh lime juice if possible. It’s a lot sweeter than store-bought lime concentrate and has a more natural lime flavor.Make your mint simple syrup ahead of time. It only takes 10 minutes of hands-on time, but then it infuses with mint for another 20-30 minutes, so you should plan ahead.Another thing to do ahead of time: make ice cubes. If you let ice sit in the freezer too long, it can take on odors. Making a fresh batch in ice cube trays is ideal! Blend up the drink first, then add few fresh mint leaves to the blender. Pulse it to combine, but don’t go too hard — the drink will turn green!