INGREDIENTS
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1 tablespoon extra-virgin olive oil
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2 tablespoons butter
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6 medium onions, thinly sliced
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Salt and freshly ground black pepper
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2 teaspoons fresh thyme, picked and chopped or poultry seasoning
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1 bay leaf, fresh or dried
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1/2 cup dry sherry
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6 cups beef stock
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4 thick slices crusty bread, toasted
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2 1/2 cups shredded Gruyere or Swiss cheese