Spread bones on a baking sheet. Roast at 400F for 30-40 minutes.
Fill pressure cooker with water, vegetables, and spices.
Add roasted bones to the pressure cooker pot. Pressure cook for 40-60 minutes.
Slow cook for 10-24 hours. This can be done in an electric pressure canner, slow cooker, or in a pot on the stove.
Line a strainer with cheese cloth and strain the broth.
At this point the broth can be frozen or canned. To can: Fill jars with broth, leaving 1 1/2" headspace.Wipe rims well with vinegar. Secure lids and rings.Pressure can for 25 minutes for quarts or 20 minutes for pints.