Horseradish Crusted Prime Rib with Peppercorn Sauce

Name: Horseradish Crusted Prime Rib with Peppercorn Sauce
Ingredients: 2 cups panko bread crumbs; 1/4 cup prepared horseradish; 1/2 cup freshly chopped chives; 4 teaspoons freshly chopped tarragon leaves; 4 teaspoons freshly chopped rosemary leaves; 1 cup stone-ground mustard; 1 (10-pound) whole prime rib, boneless; Cooking spray, butter or oil; 1/4 cup canola oil; 1 white onion, finely diced; 1 (3 to 4-ounce) can green peppercorns, drained; 1 cup brandy; 2 cups beef stock; 1/2 cup heavy cream; 4 tablespoons freshly chopped parsley leaves; Salt