1/2cupClub soda or sparkling waterplus more to taste
Muddle: Add the mint, lime, blackberries, and cane sugar to a flat-bottomed glass. Muddle for 10-15 seconds, until the sugar has dissolved and the mixture is juicy.
Assemble the Cocktail: Pour the rum over the berry mixture, then top off with ice and club soda. Stir well, pulling the stir spoon slightly upward to evenly disperse the berries. Adjust the sparkling water, and sugar to taste as necessary and serve.
Sugar: Mojitos are traditionally made with cane sugar, but you can substitute it with 1/2-3/4 ounce of simple syrup if desired.
Shaken Option: If you’d prefer for the berries to be strained out of the cocktail, muddle all of the ingredients in a cocktail shaker. Add the rum and ice to the shaker, then shake for 10-15 seconds. Strain over a glass filled with ice, top off with soda, then stir.
Mocktail: Swap the rum with an alcohol-free spirit, or top off with extra sparkling water or kombucha.