Do this
Cover the meat with cold water and bring it to a boil. Drain and rinse each piece under running water. Refill with fresh water, ginger, and green onion, then simmer.
Why it works
Blood proteins turn into grey scum. That scum sticks to the meat as the water drains. Rinsing is the only way to take it off.
When to skip it
Skip the second boil for chicken bones. One round is enough and a second one washes the flavour away.
