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Bake in a 350 F oven for 45 minutes to an hour or until the center registers 160 F on an instant-read thermometer. 1  Resist the urge to cook any form of ground beef to anything less than well-done as E coli is a real risk for undercooked ground beef.eal the foil packets tightly and bake in a 350-degree Fahrenheit oven for 45 minutes or until the beef registers 160 degrees on an instant-read thermometer when inserted horizontally into the patty.
Here's how you do it: 1  Cook the beef at 350F until its internal temperature reads 5-10 degrees below the desired doneness. 2  It'll take anywhere from 15 to 30 minutes per pound, depending on the shape of the roast, and how well done you like it. 3  Remove the roast from the oven, and let it stand for 20 minutes. This can take 4 to 8 hours depending on the size of the roast, and how cooked you like it. 2  Turn the heat up to 500F and cook it until it reaches 5 to 10 degrees below the desired doneness. 3  It shouldn't take much more than 10-15 minutes. 4  Remove the roast from the oven and let it stand about 20 minutes.