Replying to We went to a sushi bar last night

And they gave us wasabi, along with what I can only describe as a lemon flavored wet napkin, that had some zest to it. It came on the plate right next to the wasabi and in what looked like a little pile of wet napkin. It wasn't wet napkin though. It had a very strong lemon taste and a very "zingy" effect on the tongue. It was sliced very thin. I did a google search for it but couldn't find anything. Does anyone know what I happened to eat last night?