I have been cooking prime rib roasts for 30 years with just Kosher salt, freshly cracked pepper and a touch of rosemary -- and that simple mix still reigns king. I decided to try something different but was disappointed in this recipe. The orange and bay leaves taste bitter after cooking. Don't wast your time. For a 7-rib roast, I use 3 tbs salt, 1.5 tbs pepper and 2 tsp rosemary rubbed onto the roast without any oil. Then cook 20 mins at 450 and about 2.5 hrs at 250 to internal temp of 125.