Prepare the Kiwi: In a cocktail shaker, muddle the diced kiwis until well mashed and juicy.

Mix the Cocktail: Add the vodka, fresh lemon juice, and simple syrup to the shaker. Fill the shaker with ice cubes.

Shake: Shake well until the mixture is chilled, about 15-20 seconds.

Strain: Strain the mixture into a rocks glass filled with ice. If you prefer a smoother texture, you can double strain the mixture to remove the kiwi seeds and pulp.

Garnish: Garnish with a kiwi slice or a lemon twist.

Serve: Enjoy your refreshing Kiwi Vodka Sour.