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 - Stir in sliced daikon radish and continue cooking for 10 minutes until slightly tender.
04 - Add eggplant slices, trimmed string beans, and green chili peppers. Simmer for 5 minutes until vegetables start to soften.
05 - Mix in tamarind soup base, dissolving completely into the broth to achieve the signature sour taste.
06 - Add fish sauce, salt, and black pepper. Taste and adjust seasoning as needed to balance sour and savory flavors.
07 - Stir in spinach or water spinach leaves and simmer for 2–3 minutes until just wilted. Avoid overcooking to maintain texture.
08 - Ladle hot soup into bowls and serve immediately with steamed white rice.