Food choppers are designed so the operator can place a single onion, tomato, or head of lettuce on the chopper, push or pull the handle, and force the item through the cutting blades. A container placed beneath the vegetable cutter catches the processed ingredients. Fruit and vegetable choppers are heavy duty, easy to clean, and produce consistent results so you know that all lemon wedges or tomato slices will be exactly the same size. Unlike a food processor, choppers cannot be used to puree or liquefy.