How long should I cook two 15 lb boneless prime ribs?
I got tasked with hosting our large Christmas party this upcoming Sunday. We have about 30-40 people coming, so we ordered 30 lbs of boneless prime rib which are split in two 15 lb pieces. I have never cooked prime rib before, let alone this much. I found cook time for a 15 lb roast (500 degrees for 15 minutes for a sear and 325 degrees for 3.5 hours). How much extra time should be added for two 15 lb prime ribs?