Mayonnaise - Does it expire?
I bought a jar of mayonnaise last July to make a chocolate cake. I haven't used the mayo again, because I hate mayonnaise.
My question is whether the mayo is still good. It's just been sitting in my refridgerator for the past 9 months. Might it go bad? How would I know?
Yes it expires. I've never seen mayo that didn't have a printed exp date. I wouldn't use 9 mo old mayo but if there isn't visible mold, it actually is probably fine.
You bet it expires! Mayo contains two main ingredients, raw egg and vegetable oil, plus a bit of salt and other flavoring. The egg keeps longer than you'd think thanks to the preservative action of the salt and oil, but not indefinitely.