An easy way to make a lot of bone broth in an electric roaster.
Preheat electric oven to 400 degrees. Place bones in an electric roaster and cook for one hour or until browned. Reduce temperature to 150 degrees. Add water, vinegar, and salt. Let sit for one hour. Raise temperature to 250 degrees and cover. Bring to boil and adjust heat to keep at a low simmer. Cook for at least 6 and up to 48 hours. The volume will reduce by quite a bit. Watch to make sure it doesn't get too low. Let cool a bit then remove bones and strain broth through a fine sieve. Place in a non-reactive container and refrigerate until cooled. Remove fat from the top. Will keep in the refrigerator for up to 5 days or place in freezer bags or containers to freeze.
You will need to add salt and pepper to taste. Lawry's seasoning is excellent.