3/4 c sour cream
1/2 tsp. dry mustard
1/2 tsp. black pepper
1/2 tsp. salt, scant
1/3 tsp. garlic powder, scant
1 tsp. Worcestershire sauce
1 1/3 c. mayonnaise
4 oz. (1/2 c.) crumbled Bleu cheese

In mixing bowl, combine first 6 ingredients and blend 2 minutes at low speed, add mayonnaise and blend for 1/2 minute at low speed. Then increase speed to medium and blend an additional 2 minutes. Slowly add Bleu Cheese and blend at low speed no longer than 4 minutes. Refrigerate for 24 hours before serving.