this is a nifty trick that allows us to create new aromas at the table....we have been playing with various extracts and essential oils that are mixed with sawdust... they sawdust is placed in the pipe and the smoke is trapped under the plastic wrap...everytime the guest touches the food smoke rings are made.....for this dish we used a licorice smoke to go with sweetbreads and sunflower seeds....joan roca is responsible for inventing this technique