Thwack-thwack-thwack. That's the sound of the cook chopping up your Peking duck or crispy-skin roasted pork belly at this absolutely bare-bones Chinese joint in west-side strip mall. The Chinese delicacies at Wahsun are as authentic as they are inexpensive, and chances are you'll walk out with leftovers for tomorrow. One menu serves Americanized staples such as kung pao beef, Mongolian beef, and chow mein (all are excellent, BTW), but in-the-know regulars ask for a Chinese menu, which features less-familar but out-of-this-world items such as flounder, seafood tofu hot pot, whole crab in black bean sauce, and much, much more. Oh, and the egg rolls may just be the best in the Valley. Make sure you call ahead first, because this mom-and-pop operation has fluctuating hours.