Each brand is trying to find a way to get a leg up on the competition in a tight market space. The above picture is what I found on my last grocery run. What caught my eye was the asterisk next to the non-GMO popcorn claim. My guess was the ingredients list would include soybean, canola, or corn oil.
The temperature for broiling in an oven is 260 degrees Celsius or  500 degrees Fahrenheit. Medium heat is about 177 degrees Celsius or  350 degrees Fahrenheit.
The London broil that I purchased was only about 1.5 lbs so it got to a good medium rare (135 degrees F) in just over an hour. I threw it in a hot iron skillet with just a little oil for a minute or two per side to give it a good reverse sear. You could also do this on a hot grill or even under the broiler.repare the London Broil for Smoking. Remove meat from packaging, rinse in cold water and place on a cutting board or in a foil pan to keep the cabinet nice and clean. Pour on a little olive oil. Rub/brush the olive oil all over the top and sides of the meat.