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Place the carrots, celery, onions, garlic and herbs in a 14-16 quart stockpot.
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If the chicken is raw, roast it in the oven at 400 degrees F for 20 minutes, just to brown it and develop some flavor. If it's cooked, you can skip this step.
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Add the chicken into the stockpot and cover with 12 cups of water.
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Bring the stock to a boil, then cover and reduce to a simmer . Cook for 2 hours. Strain the mixture, then pour it into containers. Use within 3 days, or freeze for long term storage (up to 3 months).