Lay the lemongrass on a flat work surface and bash using the flat side of a large knife to release the oils. Cut into small pieces (about ½ cm long).
Place the lemongrass in a shaker and press firmly a few times with a muddler. If you don’t have a muddler you can use the back end of a wooden spoon or similar.
Clap mint together in your hands to release the scent, then add to the shaker. Add lime, coconut water and a few cubes of ice. Replace the lid and give it a good shake! Strain into an ice filled glass and top with sparkling water. Add rum (if using). Stir gently, garnish with lime and mint, then serve.
Seems like you are on a different site compared to your location.
