How to Prepare & cook roast beef in the oven
Heat the oven to 450 degrees F.
Remove the roast from its packaging and place it in a sturdy roasting pan.
Rub the roast lightly with the oil. Try not to get any oil in the bottom of the roasting pan.
Rub the roast with enough salt and pepper to lightly season it.
Place the roasting pan in the oven.
After 15-20 minutes, turn the heat down to 325 degrees F.
Test for doneness using an instant-read thermometer (about $5 at most grocery stores). For rare meat, remove the roast when the internal temperature reads 130-135 degrees F. For medium rare, remove at 140-145 degrees F. And for medium, remove at 155 degrees F or above. A large rib roast takes 2-4 hours to cook.
Let the roast beef rest at room temperature, without carving or cutting into it, for 20-30 minutes.