TO POOR MUMS IN CALIFORNIA:

http://www.feastingathome.com/vietnamese-hot-and-sour-tamarind-soup/

THERE'S A GIANT, ASIAN, CELERY STALK-SHAPED VEGETABLE (BAC HA) THAT'S QUITE GOOD IN CAHN CHUA ALSO. IT HAS TO BE WASHED, PEELED WITH A COUPLES INCHES TRIMMED OFF EACH SIDE. THEN DICE OR SLICE IT LIKE A HALF-INCH, CELERY STALK. IT TASTES LIKE DELICATE, LIKE A POTATO, BUT HAS A SPONGY, SPRINGY TEXTURE.

https://www.google.com/search?q=celery+vegetable+asian&oq=celery+vegetable+asian&aqs=chrome..69i57.8272j0j4&client=tablet-android-hms-tmobile-us-noonebox&sourceid=chrome-mobile&ie=UTF-8#q=+vegetable+vietnamese+stalks&imgrc=n2eV4c-8vEJ4eM%3A