Simmer the Broth Base
Place the pork ribs or oxtail, whole onion, bay leaves, peppercorns, and kosher salt into a large stockpot. Cover with cold water and bring to a boil over medium-high heat. As foam rises, meticulously skim it from the surface. Lower heat to medium-low, cover partially, and let gently simmer.
Starting with cold water extracts proteins slowly for a crystal-clear, deep bone broth. Skimming ensures no bitter impurities ruin the flavor profile.
A clean, bubbling surface with a thick layer of gray foam rising initially that leaves behind a clear broth when skimmed.