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The method of cooking a roast in a roaster is called braising. A three pound roast would cook aproximately 2 to 2 1/2 hours at 325. The inside temperature should be 140 degrees for rare, 160 degrees for medium, and 170 degrees for well-done. Use meat theomometer for this.+++Use a meat thermometer that you leave in the roast the entire time it cooks...it should reach the middle..and not hit a bone. Cook 22 minutes per lb. at 300 degrees.ut the oven up to 400 (lid on roaster) for 20 - 30 minutes and sear, then put the temperature down to â¦ 350 and cook 15 minutes per pound.   If the 4 lb. beef roast is thawed then sear as above and cook for 20 minutes per pound.
How long you would cook a 2.2 pound beef roast depends upon how you  like it cooked. For a rare beef roast, cook at 200 degrees  Celsius/390 degrees Fahrenheit for 30 minute â¦ s.s a general rule I would cook it for 1 hr per 500gms for well done - 30mins per 500grms for rare. You can also either cook it at the same temp the entire time (around 180C) or bump it up for the first 30 mins to 200c and then drop it down to 180c and do about 20 mins less all up.