INGREDIENTS
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2 tablespoons extra-virgin olive oil
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1 large onion, finely chopped
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Kosher salt and freshly ground black pepper
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1 pound cremini mushrooms, sliced
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1 1/2 cups pearl barley
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4 sprigs fresh thyme
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8 ounces carrots, finely chopped
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3 cups lower-sodium vegetable broth
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1 ounce Parmesan, grated (2/3 cup)
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1 tablespoon sherry vinegar
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1/4 cup chopped fresh flat-leaf parsley