Pour the water in a cooking pot. Bring to a boil.
Add the tamarind. Cover and boil for 30 minutes. Add more water if needed.
Separate the tamarind from the water. Make sure to squeeze the juice out of the tamarind for maximum flavor.
Heat the cooking pot with the remaining water and tamarind extract. You can add more water if you think that the amount of remaining liquid is less than 5 cups. Let boil.
Add the tomato and onion. Cook for 5 minutes.
Put-in the daikon,okra, and shrimp. Cook for 3 to 8 minutes in medium heat.
Add the spinach and fish sauce. Stir. Cover and turn the heat off.
Sprinkle some ground black pepper to taste.
Transfer to a serving bowl. Serve.
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