2 oz vodka
1 oz sour apple schnapps
1 oz fresh lemon juice
1/2 oz simple syrup
Ice
Chill a martini glass
Add vodka, sour apple schnapps, lemon juice, and simple syrup to a shaker
Fill the shaker with ice
Shake well until chilled
Strain into the chilled martini glass
Garnish with a thin apple slice or lemon twist