Good Living Serrated Lettuce Knife (Green) Plastic will not turn the lettuce brown like a traditional steel knife will. Not only does this knife work great for cutting all types of lettuce, spinach, kale and other leafy vegetables. As an added bonus it does a great job with cake decorating, tomatoes or as a fish scaling knife Also use for cleanly slicing cakes and brownies Is 100% dishwasher safe so cleanup is fast and easy.