Grandma's Secret Tip

To slice potatoes thinly enough for chips, Grandma used a really sharp knife, a mandoline or a good-quality box grater with a slicer. If she used a knife, she sharpened it before she began cutting. When she used a mandoline, which she often did, she simply passed the potato over the blade for quick, super thin slices of potato. If she used a box grater blade, she cut the potatoes into quarters first so they would fit the small blade.