Raspberries are extremely fragile and susceptible to spoilage, but you can extend their shelf life naturally with the right washing and storage techniques. Because raspberries break so easily, they are particularly vulnerable to natural surface molds and microbes that attack damaged fruit. Minimize microbe growth by gently washing the raspberries in diluted vinegar, then storing them without excess moisture. Using this method, you can enjoy clean, fresh raspberries for several days after bringing them home.
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Make a diluted vinegar bath by combining three parts water and one part white vinegar in a large bowl.
With clean hands, gently place the raspberries in the vinegar bath. Swish the berries around with your fingertips to loosen any dirt.
Carefully lift the raspberries out of the vinegar bath and place them in a colander. Rinse the berries with cold water to remove the vinegar flavor.
Line a salad spinner with a few layers of paper towels. The paper towels cushion the raspberries to help prevent bruising and breakage.
Place the raspberries in the salad spinner and spin for five to 10 seconds.
Refrigerate the raspberries in a single layer in a clean container lined with fresh paper towels. Keep the container unsealed to allow moisture and gases to escape as the berries release them.
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Use the same method to wash and store other delicate berries, such as strawberries.