INGREDIENTS
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1 cup pearled barley
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1 quart chicken stock or low-sodium broth
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1/4 cup extra-virgin olive oil
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3/4 pound shiitake, stems discarded, caps sliced 1/4 inch thick
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1 garlic clove, thinly sliced
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Kosher salt and freshly ground pepper
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1 tablespoon unsalted butter
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1/2 cup freshly grated Parmigiano-Reggiano cheese