Colleen O’Hare and Jeana Johnson turn out dazzling appetizers — fresh, fragrant and perfumed with a panoply of herbs — at their stylish little modern Vietnamese spot in Old East Dallas. Main courses, while satisfying, are much less interesting. For lunch, skip the thin-flavored pho in favor of a snazzy salad or banh mi sandwich. The friendly priced, all-French wine list works well with the...