Fish bones and meat are simmered until the broth turns opaque and rich with natural collagen. This high protein family soup base is incredibly nourishing and forms the base for many Chinese fish dishes.
Rinse the fish bones and heads under cold water to remove any blood and impurities.
Bring a large pot of water to a rolling boil. Blanch the fish bones and heads for 2 minutes, then drain and rinse again.
Add the blanched fish bones, fish fillet, smashed scallions, and sliced ginger into a clean pot with 10 cups of cold water.
Bring to a gentle boil over high heat, then immediately reduce to medium-low to maintain a steady simmer. Skim off any scum that rises during the first 15 minutes.
Simmer uncovered for 2 hours. The broth should turn milky white and slightly opaque. Season with salt and white pepper before serving or using as a soup base.