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Lettuce Knives

Does this knife deliver on its promise to prevent lettuce from turning brown after cutting?

Published July 1, 2009.

What You Need To Know

You've seen them on TV and in kitchen stores: serrated plastic knives that supposedly help prevent your lettuce from turning brown after cutting. But do they work better than tearing or using an ordinary kitchen knife? We chopped a head of romaine lettuce and a head of iceberg lettuce using three different knives: one with a stainless steel blade, one with a super-thin high-carbon steel blade, and the Zyliss Fresh Cut Salad Knife. We also tore the leaves by hand. After chopping and tearing, we refrigerated the lettuces in plastic zipper-lock bags and waited fo them to brown. Though all lettuce began showing some browning on the ribs after 10 days, none showed any signs of browning on the cut or torn surfaces. After 12 days, the heads cut with metal knives showed faint signs of browning on these surfaces, and the lettuce cut with the plastic knife followed a day later. The torn lettuce was last to brown on its ruptured edges, starting to turn at 2 weeks.

Our verdict? The plastic lettuce knife might stave off browning slightly longer than metal knives, but it's not worth the money or the extra drawer space. To prolong the life of lettuce by a day or two, stick to tearing by hand. Tearing allows leaves to break along their natural fault lines, rupturing fewer cells and reducing premature browning.

Everything We Tested

Good : 3 stars out of 3.Fair : 2 stars out of 3.Poor : 1 stars out of 3.
*All products reviewed by America’s Test Kitchen are independently chosen, researched, and reviewed by our editors. We buy products for testing at retail locations and do not accept unsolicited samples for testing. We list suggested sources for recommended products as a convenience to our readers but do not endorse specific retailers. When you choose to purchase our editorial recommendations from the links we provide, we may earn an affiliate commission. Prices are subject to change.
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