Soak 1 ounce dried shiitake mushrooms in 2 cups boiling water, covered, until soft, 40 minutes. Drain, reserving the liquid. Discard the stems and chop the mushrooms. Cook 2 cups sushi rice as the label directs, using 1/2 cup mushroom-soaking liquid in place of 1/2 cup water. Cook 1 1/2 cups frozen edamame in salted boiling water until tender, 6 minutes. Add the edamame and shiitakes to the rice; season with salt.
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