Boil the tamarind and set aside.
In a large pot, boil the beef bones and remove the bubbles appearing on top.
Add salt, and ground black pepper. Boil for 1 hour.
After 1 hour, add onion, tomatoes then cover and boil for another 30 minutes.
After 30 minutes, check if the meat is still hard if so, boil it for another 30 minutes.
Now add radish, string beans, green chili, okra, and eggplant. Boil for 5 minutes.
After 5 minutes, extract the juice from the tamarind by squeezing it. Then get 1 ½ cup tamarind juice and pour it into the pot.
Add the water spinach and cook for 1-2 minutes.
Serve hot and enjoy!