"This dish spins the irresistible flavors of French onion soup into a glorious grain bake...."
INGREDIENTS
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1 1/2 cups uncooked pearled or semi-pearled farro
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3 1/2 cups low-sodium beef or mushroom broth, plus more as needed
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1 bay leaf
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2 tablespoons olive oil, plus more for brushing the pan
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2 large onions, thinly sliced into half-moons (1 1/2 pounds total)
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1/4 teaspoon fine salt
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2 cloves garlic, thinly sliced
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2 teaspoons chopped fresh thyme leaves
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1/4 teaspoon freshly ground black pepper
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1 tablespoon sherry vinegar
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1 1/4 cups (4 ounces) grated Gruyere cheese
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3 tablespoons chopped fresh parsley, for garnish