Place all ingredients into a large pot. Water should cover the carcass and vegetables by 2-3 inches.
Cover and bring to a boil over high heat before immediately decreasing the heat to low. Simmer covered over low heat for 4 hours.
Remove from heat and allow broth to cool before separating the broth from the carcass and cooked vegetables (which can be discarded).
Broth can be stored in the fridge for up to a few days or frozen for future use.