Add the chopped kiwis and mint leaves to the shaker. Muddle gently until the kiwis release their juice.
Pour in the lime juice and simple syrup. Then, fill the shaker halfway with ice cubes.
Shake the mixture vigorously for 15-20 seconds to combine all ingredients.
Strain the mixture into a Collins glass filled with fresh ice. Then, top it with sparkling water.
Stir gently to combine. Garnish with a mint sprig and kiwi slice.
Notes
Use ripe kiwis for the best flavor. They should yield slightly when pressed.To make simple syrup, combine equal parts sugar and water in a saucepan. Heat until the sugar dissolves, then cool completely.Store leftover simple syrup in an airtight container in the refrigerator for up to 2 weeks.For a sweeter drink, adjust the simple syrup amount to taste.