Cooking times are dependent on much more than weight. The shape of the roast, the thickness, the uniformity, the outside temperature, the quirks of your grill or oven... the only way to cook a roast properly is with a probe-type thermometer. You decide what temperature you want the center of your roast and cook it until it reaches that temperature. The lower the cooking temperature, the more evenly the roast will cook. You can Google roasting temps to give you a general idea, but if you use a recipe time, you will overcook or undercook your roast, probably, 60% of the time. Probe thermometers are cheap and reliable.
SOURCE: Lost instruction manual
http://www.rivalproducts.com/manuals/MANUALS/RO188BR_43_81844057.PDF
That is the URL for the manual. I find their recommended temperatures tend to run about 25 degrees hot; be sure you check the internal temp with a quick read thermometer starting 15-20 minutes before it "should" be done.
SOURCE: how to cook a boneless beef prime rib roast
just make a cut along the rib and then pull the bone
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