Some of you have asked if Walla Walla Sweet onions are good storage onions. They are not a storage onion, and will only keep 3-6 weeks. Following are several ways to keep them.
1. Place Walla Walla sweet onions in the legs of clean, sheer pantyhose. Tie a knot between each onion and cut above the knot when you want to use one. Hang in a cool, dry, well-ventilated area.
2. Place them in the refrigerator, wrapped separately in paper towels or newspaper. This method takes up precious refrigerator space, but can preserve the sweet onions for a longer period of time.
3. Place them on elevated racks or screens, not touching and in a cool place.
4. They can be chopped and dried in the oven. Use the lowest setting and remove from the oven when thoroughly dry but not brown. Store at room temperatures in airtight containers.
5. They can be frozen. Chop and place in a single layer on a cookie sheet in the freezer. When frozen, remove and place in freezer containers or bags and seal. This method allows you to remove the amount you want when you want it. You can freeze whole onions. Peel, wash, core, then drop into a plastic bag. Once frozen, they can be removed like ice cubes.
NOTE: Freezing changes the onions' texture, so frozen onions should be used for cooking only. Whole frozen Walla Wallas can be baked.
6. If stored properly in a cool and well ventilated location, Walla Walla Sweet Onions will stay fresh for 3-6 weeks or they can be frozen for use well into the year.