Filipino
Put the pork ribs and water in a large pot, bring to a boil and skim off the foam for 5 minutes.
Add the onion and tomatoes, lower the heat, partly cover and simmer for 60 minutes until the pork is tender.
Mash the tamarind pulp with 250 ml of the hot broth, press it through a sieve back into the pot and discard the fibers.
Add the taro and radish and simmer for 10 minutes, until the taro is soft and starts to thicken the broth.
Add the eggplant, yardlong beans and green chilies and simmer for 5 minutes.
Season with the fish sauce and salt to taste; the broth should be clearly sour and salty.
Turn off the heat, add the water spinach, cover for 2 minutes until wilted, and serve hot with steamed rice.