Seeing as I can smell traces of onion in frozen food, I can also smell and taste it in unfrozen food, no matter how finely you chop it.

Some of you seem to use onion in the same way that a Canadian I know who can't use any alliums at all uses a few drops each of maple syrup & soy sauce to add that dark sweet-savoury flavour and taste to everything cooked at home.
IMHO if the ingredients are really good quality, they don't need "improvement" or "enhancement". I don't see why onion is included even in things which are overwhelmed by it, except maybe to save money.
In this life, the only allium I can safely handle (let alone eat) in even moderate amounts is garlic. Not fussy, nothing to do with needing to learn to like the taste. Merely a complex biochemical chainreaction resulting in migraine. Exposure (even being downwind of a hot dog stall for a few minutes) can take hours out of my life. Not asking for sympathy, I'm just fed up with the attitude of onion-using bigots.
Cookery lessons and school dinners were like russian roulette. I've rewritten nearly every savoury recipe I've come across (except for recipes which have onion as the main ingredient, these are ignored completely). Not just leaving out onion, but thinking about why it's there in the first place (bulk, colour, texture, sting, sweet, savoury?) then working out what can take its place. If you think this means bland, boring, or flavourless, then you're wrong.
