What do you mean by "not just heated?" oooo this hurts, I don't want to defend 5Guys. The burgers are cooked fresh. And the fries are cooked twice, on purpose. They aren't just heated up. The fries are cooked at a lower temperature, around 350 degrees until they are cooked through. Then they are drained, and cooled, ON PURPOSE. When you order them, they are cooked in much hotter oil to make them crispy on the outside. They are cooked the same way fries are cooked in Europe, crisp on the outside, tender on the inside. Frying them a second time in hotter oil also makes them retain less oil from cooking, so they aren't wimpy or soggy.
I don't make fries at home because I can't stand soggy wimpy fries. And heating oil over 400 degrees in my kitchen scares me, especially here in this raggedy little house with no ventilation in the kitchen. But I have an air fryer coming, I got a very good deal on an Instant Pot Air Fryer, one of the ones reccommended by America's Test Kitchen. First thing I'm going to do is make fried okra, it's so hard to find good crispy fried okra here, I don't understand why, this is the part of the country where fried okra originated, you'd think they could get it right..