I have made pickled onions before but it wasn't nearly as simple as just putting the onions in vinegar with a little canning salt and letting it set for a while. I don't have a root cellar to put it in (see video) but I do have an unheated (storage) room where all the canning stuff and extra food is stored right now. The Slice O' Matic worked just fine for slicing the onions though I had to cut them in quarters to fit in it and I think it will be a great help when I have things to slice up for the dehydrator.
So here are the pickled onions. I'll let you know after they get some time to sit and pickle how well I like that carrot slaw.