Sinigang na Panga ng Tuna Recipe (Tuna Jaw in Sour Broth)

1 kilogram tuna, (use tuna jaw (panga ng tuna)), cut into serving pieces

2 to 3 cups water, for boiling

1 20 gram sachet sinigang na sampalok mix

2 thumb-seized pieces ginger, sliced

2 pieces tomatoes, sliced

1 onion, sliced

5 pieces finger chilies (siling pang-sigang)

1 bundle kangkong (water spinach) leaves

1 bunch long beans (sitaw), cut into 3-inch length pieces

1 radish (labanos)

fish sauce (patis), to taste