If you take good care of your tomato knife, it will last you a lifetime. We always recommend washing your kitchen knives by hand. The heat and harsh detergents in a dishwasher damage your tomato knife, which would be a shame. Keep your knife acid-free A tomato knife is a knife with a blade length of 12 to 15 cm. The blade is serrated to easily cut through the hard skin of a tomato without having to apply too much pressure. As such, you never damage the tomato. The length of the blade gives you just enough control to cut a tomato properly. Of course, you can also use a plain-edged knife to cut a tomato. However, that only works if the knife is razor-sharp. Most kitchen knives you use regularly are not that sharp though. A serrated tomato knife is more efficient when cutting tomatoes. The forked tip It is best to clean the knife directly after use. That's how you prevent moisture and acids from affecting the blade. The knife should be completely dry before you store it. Sharpening a tomato knife