
In a shaker, gently muddle the mint, lemon wedge, and simple syrup.
Add the absinthe and ice and shake vigorously.
Strain into a Collins, highball or frappé glass.
Pack with crushed ice and top with a splash of soda water.
Stir gently with a barspoon to incorporate the soda.
Garnish with fresh mint and a lime or lemon wedge.