Use a vegetable peeler to peel off a large piece of a lemon peel.
With an xacto knife or a sharp paring knife, cut the lemon peel into the shape of a sunflower.
Take a cocktail pick with a rounded end and pierce the flower shape in the center. Being careful to not nick your fingertips, push the pick all the way through so it looks like the round end is the center of the flower.
Set the garnish aside while you make the drink.
Cocktail
Add the gin, triple sec, elderflower liqueur, and lemon juice to a cocktail shaker.
Fill the cocktail shaker with ice, seal it and shake 15-20 times.
Spray or rinse your serving glass with absinthe.
Strain the drink into the serving glass.
Add the lemon peel garnish and serve.
Notes
For the garnish, making the sunflower shape is optional. I still recommend using a piece of lemon peel even if you don't shape it -- just twist it over top of the drink and rest it in the glass.