Drying a vegetable before slicing removes moisture, providing a more secure grip and preventing the knife from slipping, which enhances safety and precision.
When vegetables are wet, a thin layer of water exists between the vegetable's surface and the cutting board. This water acts as a lubricant, significantly reducing friction. As you apply pressure with the knife, the vegetable can easily slide out from under the blade. This slippage increases the risk of cutting yourself and makes it difficult to achieve consistent, even slices. Drying the vegetable with a clean towel removes this layer of water, creating a more stable surface for cutting. The knife can then grip the vegetable more effectively, allowing for better control and safer, more precise cuts. Different vegetables have different textures, some are more slippery than others. For example, tomatoes and cucumbers are notorious for being slippery when wet.
Use a clean, dry kitchen towel or paper towel to thoroughly dry vegetables. For leafy greens, a salad spinner is an excellent tool for removing excess water before chopping.