1½ oz absinthe½ oz simple syrup (1:1)2 oz soda water8 mint leaves1 lemon wedge
instructions :

Gently muddle the mint leaves and lemon wedge with the simple syrup in the bottom of a cocktail tin.

Add the absinthe and ice; shake vigorously.

Strain into a collins, highball or tumbler glass. Pack with crushed ice and top with a splash of soda water. Use a bar spoon to gently incorporate the bubbles. Garnish with mint and a lime or lemon wedge.

source :