Inspired by 1905, which makes a similar drink with gin instead of absinthe.
1.5 oz absinthe*
1.5 oz pineapple juice
0.75 oz lemon (or a little more)
0.75 oz simple syrup (or a bit less)
8-10 mint leaves
Muddle mint in a tall glass. Fill glass with crushed ice, add other ingredients, and top with soda water.
*I use Kübler Absinthe, which is 53% abv. You may need to adjust if you’re using a stronger absinthe.