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Sprinkle boiling water on mushrooms while sauteing, to prevent them from shrinking.
Source: My Mom
By Irishwitch from Aurora, CO
When cooking mushrooms, always be sure that you cook them with low heat and do not allow them to cook too long. If you do, they will become tough and will shrivel. Very little liquid is needed in any recipe in which you use mushrooms, because they themselves are ninety percent water.