Went by Cha Ba tonight. Hadn't been there since summer. They had their po pia sod special. It's a fresh roll (as opposed to fried) filled with shrimp, chinese sausage, tofu, bean sprouts, cucumber, carrot, and green onion, topped with Dungeness crab and surrounded by a mustardy sauce and a sweet sauce. It's really tasty and a pretty large serving for a roll, though it costs $8.50. But well worth it. It's one of my favorite items that I've tried in a Thai place in Portland and they only have it occasionally.
(We also had the pad thai tofu and the stir fried green curry, both of which were good and huge portions. As I've said before, I wish they'd make the portions smaller and reduce the price.)
btw, the picture is after we'd eaten a bit of it and the spoon is a large serving spoon which throws off the scale a bit.