Chop the carrot and the celery stalks into large pieces
Cut the onion into quarters
Crush the garlic cloves
Combine the left over chicken bones and meat in a large stock pot or dutch oven with the above ingredients, add salt, pepper, and parsley leaves
Add water to the pot until just above your ingredients
Bring to a boil
Reduce heat to to a simmer, simmer for 4 hours
Using a slotted spoon, remove the chicken, bones, and pieces of vegetables, pour the remaining liquid through a strainer into heat proof jars.
Allow the jars to cool, then store in the fridge for a week or freeze for months.