I spotted this odd looking vegetable at Park to Shop in Niles (formerly Assi) a few weeks ago. It had a non-English label and looked really crummy but I looked it up when I got home and learned the term celtuce and have kept an eye out for it which wasn't long since...
Sure enough, I spotted it again at Joong Boo in Glenview last weekend and tried it tonight. It's a 20 inch long stalk that tapers from 2 inches at the cut end to a few leaves, sort of resembling an oversized asparagus stalk. I got right into cutting some coins and munching: not much there for flavor, a bit of lettuce bitter backnote, juicy-crisp texture. I peeled the next few inches and found the bitterness knocked way back.
This would be a good substitute for cucumber. Neat veggie, worth picking up, probably fun to bring to a gathering. The ones at Joong Boo are individually wrapped and looked quite nice, $2.99/lb, I think. I didn't expect to see a thread about it already, lol.