Creating your Grilled Flank Steak Pinwheels is simple when you follow these steps:

1. Prepare the Marinade: In a small bowl, mix olive oil, garlic, salt, pepper, and paprika.
2. Marinate the Steak: Place the flank steak in a shallow dish and pour the marinade over it. Let it marinate for at least 30 minutes, or up to overnight in the refrigerator for deeper flavor.
3. Preheat the Grill: Heat your grill to medium-high heat.
4. Flatten the Steak: Once marinated, place the flank steak on a cutting board. Use a meat mallet to gently pound it to an even thickness, about ½ inch thick.
5. Add Fillings: Spread the spinach leaves evenly over the steak. Sprinkle the feta cheese, sun-dried tomatoes, and fresh basil on top.
6. Roll the Steak: Starting from one end, carefully roll the steak tightly into a log shape. Secure the roll with kitchen twine or toothpicks at intervals.
7. Grill the Pinwheels: Place the pinwheels on the preheated grill. Cook for about 10-15 minutes, turning occasionally, until the steak reaches your desired level of doneness (medium-rare is about 135°F).
8. Rest and Slice: Remove the pinwheels from the grill and let them rest for 5 minutes. Slice into rounds, about 1 inch thick.
9. Serve Warm: Arrange the sliced pinwheels on a serving platter.

These steps will guide you through creating your incredible Grilled Flank Steak Pinwheels with ease.