Five Guys exclusively uses peanut oil to fry its food, and according to Chad Murrell, the son of founder Jerry Murrell, the use of peanut oil helps give the fries a much better taste and texture. "Lots of people prefer to use hydrogenated oils for a crisper fry," explains Murrell, adding, "But we want that melt-in-your-mouth buttery taste that nonhydrogenated oil offers."