That is a handy find! What you have there is an onion holder slicing guide (sometimes also called an onion fork or slicing aid).
🍴 How It Works
The primary purpose of this tool is to make slicing round, slippery vegetables completely effortless and safe.
- The Setup: You push the long stainless steel tines straight down into a peeled onion, tomato, potato, or lemon until the plastic guard rests near the top.
- The Slicing: You guide your chef’s knife down between the metal tines.
- The Result: The tines act as a perfect geometric template, allowing you to get completely uniform, even slices every single time without the vegetable rolling around on your cutting board.
