How to make perfect McDonald's style french fries

After cooking over 43 batches of french fries in three days, Kenji is happy to report that has has finally found a way to make perfect McDonald's style fries. He writes: "Anyone with a buck can get a batch of fully cooked McDonald's fries, but I was after something more. I wanted to get fries from the store in their fully frozen state so that I could examine their surface for clues on how they were parcooked."