Chopping onions can become a tearful event, so when it comes to dicing 3#’s (pounds) you need an efficient way of getting them in and out.
You need to set up something like an assembly line, when dealing with a lot of repetitive actions like this, do the same step ONCE through everything you have.
—- remember that fuzzy side we left on? Don’t plank or slice to far into it, that’s what’s keeping the onion half together for the most part.
Remember do the same step ONCE, go through all the onions on each single step. This is how caterers and restaurants get their food prepped and out the door.