01 - Rinse beef shank or bones thoroughly under cold water and place in a large stockpot.
02 - Add carrots, celery, onion, garlic, leek, bay leaves, peppercorns, thyme, parsley, and salt to the pot.
03 - Pour in cold water ensuring all ingredients are fully submerged.
04 - Heat over medium-high until the mixture reaches a gentle boil.
05 - Remove any foam or impurities rising to the surface with a ladle.
06 - Reduce heat to low and simmer gently, uncovered, for 3 hours, skimming occasionally and adding water if needed.
07 - Remove from heat and strain broth through a fine mesh sieve into another vessel, discarding solids.
08 - Taste and add additional salt as necessary.
09 - Serve hot as a clear broth or use as a base for other dishes. Cool and refrigerate or freeze if storing.