A while ago someone posted a picture on Reddit of an old cast iron rotary food grater/slicer and asked "what is this thing?". A bunch of people said it was for grating things like cheese or slicing vegetables. Some people posted the original French or Italian names of it, which was difficult to find. Someone said look up "Rotary grater" and they're all over Amazon for dirt cheap. I bought a cheap plastic one for like $20, figuring I'd use it a few times and forget about it.

I use the damn thing multiple times a week for grating blocks of cheese. It can grate a 1 pound block of cheese in like 30 seconds, 2-3 rotations usually gives me more than enough cheese for myself. It's so much easier to use than a box grater, and no possibility of destroying your finger tips or knuckles!