INGREDIENTS
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1 pound yellow onions, halved and thinly cut lengthwise
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3 to 5 sprigs of fresh thyme
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1 bay leaf
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1/4 teaspoon sea salt
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Fresh cracked pepper
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1 teaspoon all-purpose flour
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1/2 cup dry white wine
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2 cups beef stock
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1 cup water
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1 1/2-inch-thick slice of ciabatta bread cut in half
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2 tablespoons unsalted butter
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1 1/2 cups grated Swiss Gruyère cheese