I recently noticed a jar of these in the relish/pickle aisle of my supermarket. I think "smothered" would be a better description. They are coarsely chopped onion that has been sweated in oil.
I try to keep a supply of the homemade version of partially-cooked onion in the freezer, to speed meal preparation when time is short, and as first aid to sauces or soups which, after cooking, still need help. But this is a good back-up to keep in the pantry. They also have jars of similarly "fried"
bell peppers with onion. Great for topping burgers or sausage if you haven't already got the fixings
to make your own. Or for the cooking-impaired. A 12-oz jar of either is about $2.50, which is a decent price to pay for the convenience factor. Just used some in making a quick omelet.