Add the kiwi pieces to the cocktail shaker and muddle until they form a pulp.
Pour in the vodka, lime juice, and simple syrup.
Fill the shaker with ice and shake for 15-20 seconds.
Double strain the mixture into a highball glass filled with fresh ice.
Top with club soda and stir gently.
Garnish with a fresh kiwi slice.
Notes
The drink can be made sweeter by adding more simple syrup.Fresh kiwis work best - frozen ones can make the drink too watery.Storing leftover simple syrup in the fridge extends its life to 2 weeks.Double straining removes kiwi seeds and pulp for a smoother texture.The recipe makes one serving and takes about 5 minutes to prepare.