Choose bones, meat, or vegetables
Place ingredients in a large pot
Add cold water to cover everything
Add salt if desired
Add aromatics such as onion, garlic, carrot, and celery
Bring to a gentle boil
Reduce to a low simmer
Skim off foam and impurities
Simmer for several hours
Strain out the solids
Cool the broth
Store in the refrigerator or freezer