"Onions are versatile and flavorful. You can use them in salads, sandwiches, soups, baked goods, and more. When shopping for groceries, onions are something many people buy in bulk."
". . . sometimes you may end up with onions from over a month ago, whether raw or cooked. You can tell an onion is bad if it starts being mushy, has dark spots, or starts to sprout."
"Lack of Drying and Curing - Lack of drying and curing the onions after harvest can make them rot. Such onions begin to rot after 4-5 weeks in storage."