In a medium mixing bowl whisk together the sour cream, mayonnaise, buttermilk, lemon juice, Worcestershire, green onions, garlic and pepper.
Season with salt then add the crumbled blue cheese and stir to combine.
Serve or store refrigerated in an airtight container for up to 1 week.
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Notes
Pick a creamy blue cheese you can crumble yourself rather than one that is pre-crumbled. Some varities that crumble well include Maytag, Roquefort, Gorgonzola or Danish blue.