Starting a beef bone broth batch with chuck short rib bones from leftover Caldereta (Filipino beef stew). Going to do the (30 minute) acv soak this time, and this site says:

After you’ve placed your bones in your pot, pour the ACV in, then fill your pot with cold water. Then you’ll leave your pot off of the heat for at least 30 minutes. Leaving the stock pot away from heat for that 30 minutes (or even longer) prevents the heat from killing off the live cultures and enzymes in the ACV before they can do their good work. From there, add your veggies and a bit of sea salt, turn on the heat, and let it cook.


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