A rotary grater and/or slicer includes a grater body, the grater body including a cutter housing portion and a vertical hopper portion connected to the cutter housing portion, the vertical hopper portion of the grater body being configured to hold a workpiece for grating; a rotatable cutting device, the rotatable cutting device configured to be rotatably disposed inside the cutter housing portion of the grater body, the rotatable cutting device comprising a plurality of blade members for grating the workpiece; and a rotary input device coupled to the rotatable cutting device, the rotary input device configured to rotate the rotatable cutting device. The vertical hopper portion is configured to serve as a handle for the rotary grater and/or slicer, and the vertical hopper portion is used for feeding the workpiece to the rotatable cutting device.