In a pot, pour in 500 ml water and toss in tamarind. Bring to boil. Set aside.
In another pot, add 1 ltr water. Put in pork and onion, and sprinkle with salt. Bring to boil.
While waiting for the pork to get tender, crush tamarind with your bare hands. Then, filter using a strainer or squeeze using a clean cloth to get the tamarind juice.
While boiling the pork, skim the scum.
Add taro, radish, and sliced tomatoes. Continue to boil until taro and radish softened.
Pour the tamarind juice. Then add the green chilies, string beans and water spinach.
Cover and simmer for 5-8 minutes or until the spinach and string beans are cooked.
Serve while hot. Share and enjoy!