3. Lettuce Knife.
Lettuce knives promise the seemingly impossible — your lettuce won’t go brown after you cut it. But do they actually work? Well, according to the gadget gurus at Cook’s Illustrated, lettuce knives do keep the leaves brown-free slightly longer than metal knives, but not enough to make it worth the added expense. The best way to stave off browning, they write, is to tear the the leaves by hand.