After boiling pork to make Goi Cu Sen Non Tom Thit (Vietnamese Young Lotus Root Salad with Shrimp and Pork) I like to use the porky broth to make a simple soup. If you're not already boiling pork for another recipe, then I suggest using pork spare ribs instead.
I like the crunchy starchiness of lotus roots and don't need anything else besides salt and fish sauce to taste. Maybe I'll add a dried date for sweetness, but that's about it. A very basic soup for sure. Guess that's why these photos have been sitting around since June 2008.
Perhaps if I were to photograph this soup again I would add more ingredients. Or perhaps not. Canh isn't supposed to be hearty enough to make a meal. Just a light starter before the main course.