Tangy Blue Cheese Dressing Recipe

In a large skillet, saute onion in oil until softened. Reduce heat to medium-low; cook, uncovered, for 30-35 minutes or until deep golden brown, stirring occasionally. Set aside to cool. In a small bowl, whisk the mayonnaise, sour cream, buttermilk, pepper sauce and Worcestershire sauce. Stir in cheese and onion. Store in an airtight container in the refrigerator for up to 2 weeks.