01 - Bring water to a boil in a large stockpot. Add pork chunks, skimming off any scum that rises to the surface for a clear broth.
02 - Add quartered tomatoes and onions to the pot. Simmer for 20 minutes until pork begins to tenderize.
03 - Add daikon radish slices and continue cooking for 10 minutes until slightly softened.
04 - Stir in eggplant, string beans, and green chili peppers. Simmer for 5 minutes until vegetables start to soften.
05 - Mix in tamarind soup base until fully dissolved, ensuring the broth achieves the desired tangy flavor profile.
06 - Add fish sauce, salt, and black pepper. Taste and adjust seasoning according to preference.
07 - Add spinach or water spinach leaves and simmer for 2-3 minutes until just wilted. Avoid overcooking to preserve texture.
08 - Ladle hot soup into bowls and serve immediately with steamed white rice.