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In a frying pan over medium heat, heat oil. Add the onions and salt,
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Add the onions and salt, cook, stirring frequently, until the onions are caramelized, about 20 minutes.
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Add the garlic and cook for another minute.
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Transfer onions to a bowl and let cool to room temperature.
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In a bowl, stir together the sour cream, mayonnaise, Worcestershire, cayenne pepper and black pepper.
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Stir in the onion.
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Cover and refrigerate for at least an hour.
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Don't insult the dip with vegetables, serve with potato chips.