Tbf McDonalds is also double fried, just the first time happens before they are flash frozen and sent to the restaurant.
Sysco does or used to sell a french fry that was indistinguishable from McDonald's when cooked similarly. They had a catalog that visualized lined up individual representative french fries.
Okay, I didn't want to elaborate the entire recipe :)... was just a way of making a small joke by making it sound like the Champagne wine region.
That's how my grandfather made them using peanut oil. Blanch and then fry, with a thermometer in the oil.