The beef soup at Chinatown's San Dong Noodle House (formerly Santong Snack) is a rich, full-bodied potion, dark in color and redolent with the aroma of long-simmered meat. If you order the Roast Beef Soup Noodle, you get the broth plus a handful of baby bok choy, a pile of long, medium-thick wheat noodles, and diced, pickled vegetables. If you order the Roast Beef Noodle (and you should), you get all of the above as well as several large chunks of beef. Make no mistake: The richness of the broth comes from the fattiness of the beef. This is no soup for a diet. But boy, does it hit the spot. The staff can be a bit impatient if you dither at the counter about your order, but in part that's because of the line of hungry people behind you.