01 - Place beef bones and optional lean beef in a large pot. Cover with cold water and bring to a boil over medium-high heat.
02 - As the liquid reaches a boil, skim off any foam or impurities that surface to maintain clarity.
03 - Incorporate carrot, onion, celery, garlic, bay leaf, peppercorns, parsley, thyme if using, and salt.
04 - Reduce heat to low and simmer gently, uncovered, for 40 to 45 minutes, skimming occasionally to keep broth clear.
05 - Pass the broth through a fine-mesh sieve or cheesecloth into a clean container, discarding solids.
06 - Adjust salt to taste and serve warm in cups as a soporific starter or drink.