INGREDIENTS
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4 Tbsp unsalted butter
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4 large yellow onions, sliced
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1 bay leaf
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Fine sea salt and freshly ground black pepper
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1 garlic clove crushed
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1 Tbsp sherry vinegar
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1 Tbsp molasses
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4 (1-inch) thick slices of baguette, toasted
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4 oz Swiss or Gruyere cheese, shredded