01 - Wash all vegetables thoroughly. Chop carrots, celery, parsnip or turnip, and potato into rough chunks. Quarter the onion, slice the leek, and smash garlic cloves.
02 - In a large stockpot, combine the prepared vegetables, parsley, thyme, dill, peppercorns, coriander seeds, bay leaves, and salt.
03 - Pour 8 cups of cold water into the stockpot. Bring the mixture to a gentle boil over medium-high heat.
04 - Reduce heat to low and simmer uncovered for 1 hour. Skim off any foam or impurities that rise to the surface occasionally.
05 - Remove the stockpot from the heat and allow the broth to cool slightly for easier handling.
06 - Pour the broth through a fine mesh sieve or cheesecloth into a large bowl or separate pot. Discard the vegetables and herbs.
07 - Taste the broth and adjust seasoning if necessary. Use immediately, cool completely and refrigerate for up to 5 days, or freeze for up to 3 months.