Muddle gently to release the mint oils and mash the mango.
Pour in vodka, lime juice, and simple syrup.
Fill the shaker with ice and shake for 15 seconds.
Strain into a highball glass filled with fresh ice.
Top with club soda and stir gently.
Garnish with a mint sprig and mango slice.
Notes
The drink works best with ripe mangoes that are soft to the touch.Fresh ingredients make a big difference - use real lime juice instead of bottled.Store-bought simple syrup works fine, but it's easy to make at home by mixing equal parts sugar and hot water.If the mango is very sweet, reduce the simple syrup to 1/2 oz.This recipe makes one serving. Double or triple the ingredients to make multiple drinks.