Ingredients:

• 1 lb. flank steak, pounded 1/4-inch thick
• 2 tbsp. extra-virgin olive oil
• 1 tbsp. freshly chopped rosemary
• 1 tbsp. Dijon mustard
• 2 tbsp. Worcestershire sauce
• Kosher salt
• Freshly ground black pepper
• 1/2 (1-lb) bag frozen French fries
• Steak sauce, for serving

Directions:

1. Preheat oven according to French fry package directions. Slice steak against the grain, on the diagonal, into thin 2-inch-long strips. 
2. In a large bowl, whisk together olive oil, rosemary, Dijon, and Worcestershire, then add steak and toss to coat. Let marinate in the fridge, at least 15 minutes and up to 2 hours. When ready to grill, generously season with salt and pepper. 
3. Meanwhile, bake frozen fries according to package directions. Let cool slightly. 
4. Heat a grill to medium-high or heat a grill pan over medium-high heat. Grease grates or pan with vegetable oil. Place four to five baked French fries on top of a piece of steak and roll up; secure with a toothpick. Repeat until all steak and fries are used up. 
5. Grill until charred, about 2 minutes per side for medium-rare. 
6. Drizzle with steak sauce before serving.