How does Burger King do it?

That is a secret that I think only Burger King employees know, or at least the ones that make the food. Trying to think if the people who clean the tables, drive thru people, or the counter people would know that secret. But maybe they use very little to know oil or grease. But since I have not worked at Burger King, or even to my knowledge of working at Burger King, I don't know how they do it. And don't McDonalds have a dollar menu to. Plus the fact that Burger King has to keep up with Competition like McDonalds, and other fast food burger places.