First Make this
Boneless Prime Rib RoastAu Jus:
Heat fat from roast, drippings or butter in large pot over medium/high heat. If using fat, remove leftover chunks once fat has melted down.
Reduce heat to medium then add grated garlic. Sauté for 30 seconds while stirring.
Add white wine, cook for 30 seconds.
Sprinkle in flour while stirring and cook until golden brown.
Slowly stir in beef broth then add Worcestershire sauce, rosemary and thyme.
Simmer 10-15 minutes.
(optional) Stir in horseradish and serve au jus alongside sandwiches.