Prime Rib Soup

Place the ribs in a large pot and cover with water. Bring to a boil; reduce heat to medium-low cover and simmer until the meat is falling from the bones about 2 hours. Remove the ribs and allow to cool. Trim the meat from the ribs and cut into bite sized pieces; refrigerate. Continue simmering the broth until reduced to 1 cup; refrigerate until the fat congeals to the top.

Skim and discard the congealed fat. Pour the broth into a saucepan along with the meat trimmings beef stock potato mushrooms salt and pepper. Bring to a boil; reduce heat to medium-low cover and simmer until the potatoes are tender about 20 minutes. Sprinkle with chives to serve.