We conventionally think of onions as being fresh vegetables, however, they’ve been dried or cured before they reach the supermarket. Having been preserved in this way, they’ll keep in the fridge for 2 or more months, depending on when they were harvested. Sweeter onion varieties will have a shorter shelf life, however, due to their high sugar and water content. It’s best to store onions in the fridge for maximum shelf life, and opt for an open container so that plenty of air can circulate between the bulbs. It’s a good idea to line the base of the container with paper to absorb any excess moisture otherwise the onions might start to rot. Alternatively, you can keep onions in a cold basement or garage using a rather unique storage vessel. Producers actually suggest keeping bulbs in a clean pair of pantyhose with a knot tied in between each one.
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