Prepare a large pan of lightly salted water and put the chips on to boil.
It's important that the chips are thoroughly cooked, to the point where the corners or edges begin to crumble, as you can see in the photo lower down, and become irregular.
It's a bit tricky, as the chips become fragile once cooked, but it's worth knowing that the more cooked the chips, the better they'll be. But do take care; a few minutes too long and you'll end up with potato soup.