1. In a stockpot, place guava and cover with water, boil until guava softens.
2. Strain and mash guava into a fine strainer, reserving the juice for soup flavor.
Set aside.
3. In the same stockpot, heat a little oil, add the red onion, garlic, and tomatoes. Sauté.
4. Add water and let it boil. Reduce boil and add the bangus belly. Simmer until the fish is cooked. Remove fish from the water.
5. Add the sitaw and kangkong stems. Put back the fish when the sitaw is almost cooked. Add the kangkong leaves and fish sauce. Season with salt.
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