Can we store cut up onions in the fridge or onions go bad in the fridge? Do they become poisonous?Can Onions Be Safely Stored in the Refrigerator After Peeling?Also how can you tell if an onion is bad?
The general rule is, it is safe to keep in the fridge (in a sealed container) for about a week. However, I strongly advise against it, as the taste and flavor will suffer. Cut onions will get more and more pungent as they wait.
Even the direction of the cuts contribute to how pungent it gets after being cut.
Restaurants store cut onions refrigerated all the time. But try and use them in one shift but they will last longer.
They will go soft which is not yet bad but good to eat.
At home try and cut on demand.