In a food processor, blend together all ingredients (except the stock) until a paste forms.
Add cold stock and meat mixture to a large stock pot. Set over medium heat and stir only for the first couple of minutes to incorporate the meat into the stock. Do not stir again.
As the stock heats, the meat and vegetables will rise to the top and form a ‘raft’ of solids. Slowly simmer the stock (DO NOT BOIL!) and, using a ladle, break a hole in the middle of the raft and carefully ladle the broth over the solids.
After 1 hour, strain the broth through a double layer of cheese cloth. Do not pour the stock, but rather ladle it through the cloth slowly so you don’t break up the solids. Season your broth with red wine vinegar, salt, pepper and enjoy!