Combine 1/2 pound blue cheese, sour cream, buttermilk, mayonnaise, vinegar, olive oil, sugar, garlic, and pepper in a bowl; blend using a hand mixer; chill until serving.
Build the salad by placing 1 lettuce wedge on each of 8 plates. Drizzle equal amounts of dressing over each wedge. Scatter tomatoes, onion, and 1/2 pound blue cheese over each salad.
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