To make gaufrettes, you will need a vegetable slicer with a ripple blade. Peel but don’t square the potatoes and slice them ⅛ inch thick. Make the first cut with the ripple slicer, then rotate the potato one-quarter turn to make the next cut. Continue to rotate the potatoes one-quarter turn back and forth as they pass across the rippled blade to give them the traditional open basket-weave design that resembles a waffle. Cook as for the Potato Chips on, about 3 minutes.