In pot, boil legs for 30 mins in water. Strain and rinse.
Throw bones back into clean pot and add rest of ingredients. Slowly cook 8-12 hours. Allow cool for 10 minutes and discard solids and strain into container.
Chill in fridge over night or until fat solidifies on the very top. Skim off the fat with a spoon. Strain once more into storing container of choice and broth is ready to use.