In the bottom of a shaker, muddle strawberry slices and mint leaves. Add lemon juice, vodka and simple syrup.
Fill with ice and shake ingredients well.
Strain into a coupe glass.
Top with chilled soda water and serve.
Notes
To make this cocktail sugar-free, omit the simple syrup and only use 1 oz lemon juice total. The sweetness of the strawberries will balance out the other ingredients.