Wash all vegetables and cut as desired. Soak the tamarind in hot water to extract the sour flavor. Marinate the fish with a little fish sauce and sliced onion to let it absorb the flavors.

Bring water to a boil, then add the tamarind juice, tomatoes, and pineapple. Let the flavors blend to create a sweet and sour broth. Season with 2 tablespoons fish sauce, then add the fish. Finally, add the okra and taro stem. Adjust seasoning to taste. Serve the soup in a bowl, garnish with green onion, cilantro, and rice paddy herb. For a spicy kick, add a few slices of chili pepper.