A Uienkam is a household appliance
A uienkam is used when cutting a out. It consists of a metal or plastic handle where several steel pins are attached. These pins are shot in the onion, then you can easily cut the onion into slices with a knife, without having to cut into your fingers. For smaller snips you can turn the Uienkam and cut again. The Uienkam can also be used to cut a tomato.