Sláinte to that!
1 1/5 oz Absinthe
1/2 oz Simple syrup
4 oz Seltzer
Put 8-10 mint leaves into a tall glass. Gently and briefly, so as not to break or bruise, use the back side of a bar spoon to press the leaves against the sides of the glass, until you can smell the mint. To this, add absinthe and simple syrup. Stir to combine, and add seltzer. Top fully with ice, and garnish with as much mint as your glass will hold, giving the bunches a quick slap between the hands beforehand will release oils on the surface and make the mint more aromatic. Add a straw and enjoy.
Via Ian McCarthy of Sharpshooter SF