INGREDIENTS
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2 tablespoons extra-virgin olive oil
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2 medium yellow onions, chopped
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2 celery stalks, chopped
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2 carrots, chopped
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2 cloves garlic, minced
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3-4 cups chopped mushrooms (a mix of button, shitake and portobellas)
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6 cups reduced-sodium beef broth (more to add the next day if too much liquid gets soaked up)
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2 tablespoons sherry
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1 cup barley
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kosher salt & freshly ground black pepper
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shredded parmesan, for topping