INGREDIENTS
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4 large garlic cloves
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4 boneless, skinless chicken breast halves
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4 thin slices Serrano ham, prosciutto or deli-smoked ham
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4 thin slices Manchego, Parmesan or Gruyere cheese
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Leaves from 4 sprigs of tarragon or thyme
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Salt and freshly ground black pepper to taste
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1 medium Spanish onion, very thinly sliced
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1/4 cup plus 2 tablespoons olive oil, preferably Spanish
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1/4 cup dry Spanish sherry