Well-executed traditional Vietnamese fare makes this family-run restaurant an unexpected gem on the Main St. corridor. Ga uop xa is succulent chunks of grilled chicken delicately scented with lemongrass, guaranteed to disappear as soon as it hits the table. Available only after 3 p.m., banh xeo is worth the waitÑa delicate turmeric-laced rice-flour crpe studded with shrimp and scallions, encasing a filling of bean sprouts and mixed seafood.