Although scent simulators are being worked on I don't think anything commercially viable exists. But as long as we're indulging in science-fiction why not a teleporter system so viewers can actually slide out a little drawer and taste the results themselves.

I could be wrong on the science, but like Televisions replicate colors using Red Green and Blue light, such a system could use a selection of substances, and combinations of certain substances could produce the likeness of a certain scent.