INGREDIENTS
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3 tablespoons unsalted butter, cut into pieces (olive oil for vegan)
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4 lbs yellow onions, halved and sliced vertically into 1/4-inch-thick slices
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2 cups water, plus extra for deglazing
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1/2 cup dry sherry
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6 cups low-sodium vegetable broth
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6 sprigs fresh thyme
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1 bay leaf
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Salt and freshly ground black pepper
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1 small baguette, cut into 8 1/2-inch slices
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4 ounces Emmental, Gruyère or light Swiss cheese (substitute vegan or leave off for vegan)