Step 1

In a large pot, bring the chicken, garlic, onions, carrots, celery, black peppercorns, and 4 quarts of water to a boil over medium-high heat. Reduce heat and simmer the stock, uncovered, for 3 hours. Skim off any foam that rises to the top and add water as needed to maintain the same level of liquid in the pot.

Step 2

Add additional liquid if necessary, but cover the pot and simmer for 2 hours more until a rich stock forms. Add the aromatics and simmer for another hour until a rich stock forms, about 1 hour more. Let cool slightly. Using a fine-mesh strainer, strain the stock into a large bowl; season with salt. Let cool. Transfer to an airtight container. Refrigerate for up to 1 week or freeze for up to 3 months.