I'll go anywhere, but have no car to call my own, so would prefer suggestions in DC or on Metro. The dumpling is the key (shrimp only, not the pork-and-shrimp kind please), but related menus welcome, as are Tampopo-style noodle comparisons. A place with an interesting vegetable list (e.g. Mark's Duck House has mustard greens) or unusual casseroles would be highly valued. Thanks!