Sprinkle the roast with tenderizer as the label directs. Then roast it in slow oven (300 to 325°) like Standing Rib Roast. It takes about 2¼ hours for a 4-lb. sirloin tip to roast rare, 2¾ hours for medium and 3¼ hours for well-done meat. If you use a roast-meat thermometer, the temperatures are 140° for rare, 160° for medium and 170° for well-done.
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