INGREDIENTS
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2 teaspoons finely chopped onions
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2 teaspoons white vinegar
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1 1/4 cups mayonnaise
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1/4 teaspoon salt
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1/2 teaspoon garlic powder
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1/4 cup sour cream
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1 teaspoon lemon juice
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1/4 cup half-and-half
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1 teaspoon Worcestershire sauce
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1 1/2 teaspoons ground black pepper
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2 -3 teaspoons cracked peppercorns
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1/4-1/2 cup freshly grated parmesan cheese