How to Make It
Preheat oven to 425°F. Toss fries with rosemary and salt on a large, rimmed baking sheet. Bake in preheated oven until crisp and fragrant, about 45 minutes.
Meanwhile, combine hot sauce, butter, vinegar, and Worcestershire sauce in a 1-cup glass measuring cup. Drizzle sauce and ranch dressing over hot, crisp fries. Sprinkle with blue cheese, and serve immediately.