Use two separate glasses at first. Add 7-up to one, absinthe to the other. Light absinthe on fire, wait for 5 seconds, then pour it into 7-up glass. Be extremely careful while pouring! Set absinthe cup upside down with a straw underneath the edge and inhale through the straw. Then take the shot.
This drink recipe was submitted by one of our magnificient readers, Davestien!