I ordered a "spaghetto" (not "spaghetti") kit a couple of years ago from Spain. It was created for one of the items at el bulli, the parmesan spaghetto. Basically, it is an agar gelled Parmesan serum.
The method is brilliant, and it is one of those things that I wish I could have come up with myself. But I didn't. I used it once in 2007, succeeded, was in awe of it, then put it away until recently.
You make the agar jelly, then pour it into a squeeze bottle, then squeeze the liquid into a 3 ft long plastic tube, then dunk the tube into an ice bath so it sets quickly. They make a special attachment for the iSi heavy cream whippers, which is a plastic nozzle that screws into the whipper where you would typically screw in a tip where the contents of the whipper would come out of. This special nozzle fits snugly inside the tube with the gelled agar. Once you charge the whipper with nitrogen, you push the nozzle into the tube with the agar gel and gently squeeze. If it doesn't come out, you can put the tube inside a bowl with warm water to loosen it up without melting it (agar is not thermoreversible). Just a little pressure from the whipper will push the whole thing out. It looks disturbing but amazing at the same time, how this perfect tube of jelly slowly comes out of the plastic tube, coiling onto itself (I used 250 g cherry poaching liquid and 4 g of agar, combined, boiled them for 5 seconds, then forced it into the tube while it was still hot).
This dessert is a house made pistachio marzipan wrapped around a cherry genoise, with a quenelle of pistachio chantilly coated in pistachio velvet. The blackness is black sesame gelee.