I was making a Gyro for lunch today and just needed a few slices of fresh onion. So I just cut off a bit of a medium sized onion and then used the ol' FoodSaver to seal it back up. After about 9 hours now (at room temp), I must say, it still looks pretty pristine.
In anticipation of this. I looked at the interwebs and most of the advice was to saran-wrap it and put it in the fridge - but never to treat it as fresh from that point on.
Surely I'm not the first person to try this. Is this bad? Dangerous?