Collins
Cut 1/4 lemon 4 pieces. Place lemon pieces into the base of a cocktail shaker. Muddle until broken down and juice has been expressed. Add liquor, vodka, and citrus syrup, then fill shaker with ice. Shake until combined and chilled. Pour contents into chilled collins glass. Add seltzer and gently lift with a barspoon to combine. Top with additional ice and garnish with a lemon slice.