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.
Grilling the Meat. If you've marinated the meat in the refrigerator, take it out while the grill is heating up. Remove it from the marinade and place the London broil on the hot grill. Cook the meat for approximately 8 to 10 minutes on each side until the internal temperature reaches 130 to 135 F for medium-rare. Although the U.S. Department of Agriculture recommends cooking beef to a minimum of 145 F, cooking London broil to higher temperatures typically yields tougher meat.