01 - Wash all vegetables thoroughly. Chop carrots, celery, parsnip, and onion into large chunks. Slice the leek into rounds, using only the white and light green parts. Smash the garlic cloves with the side of your knife.
02 - Place a large stockpot over medium-high heat. Add all prepared vegetables—carrots, celery, onion, leek, parsnip, and garlic—into the pot.
03 - Add the parsley bunch, thyme sprigs, rosemary sprigs, bay leaves, whole black peppercorns, and salt to the vegetables in the pot.
04 - Pour in 8 cups of cold water, ensuring all ingredients are fully submerged. Bring the mixture to a boil over medium-high heat.
05 - Once boiling, reduce heat to maintain a gentle simmer. Cook uncovered for 1 hour, occasionally skimming any foam that rises to the surface with a ladle.
06 - Remove the stockpot from heat. Set a fine-mesh sieve or cheesecloth over a large bowl or container. Pour the broth through the sieve, discarding all solids.
07 - Taste the broth and adjust salt if needed. Let cool completely before refrigerating or freezing. Store in airtight containers.