This really isn’t a recipe, per se: it’s more of an advanced ingredient prep. It takes a while, but most of the work is in cutting up the onions. As long as you keep the heat fairly low, the onions can spend most of their time on the stove doing their own thing.
Something really magic happens when you caramelize onions this way. They take on a sweetness and a depth of flavor that no seasoning mix that you buy from the store can add to a dish. And I forgot to mention it in the video, but the best part of doing this is that your house smells absolutely amazing for the rest of the day.