Follow these simple steps to create your Cilantro Steak Tacos:

1. Marinate the Steak: In a bowl, mix olive oil, lime juice, minced garlic, cumin, smoked paprika, cayenne pepper, salt, and pepper. Add the flank steak and ensure it’s well coated. Allow it to marinate for at least 15 minutes, or up to 1 hour for enhanced flavor.

2. Preheat the Grill or Skillet: Heat your grill or a skillet over medium heat. Lightly oil the surface to prevent sticking.

3. Cook the Steak: Remove the steak from the marinade and place it on the grill or skillet. Cook for about 4-5 minutes per side for medium-rare, or until it reaches your preferred doneness. Use a meat thermometer for precision; the internal temperature should read 130°F for medium-rare.

4. Rest the Steak: Once cooked, remove the steak from the grill and let it rest for 5 minutes. This step is crucial for retaining the juices.

5. Slice the Steak: After resting, slice the steak against the grain into thin strips. This ensures tenderness in each bite.

6. Warm the Tortillas: Heat the corn tortillas on the grill or in a skillet for about 30 seconds on each side until warm and pliable.

7. Assemble the Tacos: Place a few slices of steak on each tortilla. Top with chopped cilantro, diced tomatoes, red onion, and avocado slices.

8. Add Optional Toppings: If desired, add a dollop of sour cream or Greek yogurt and a squeeze of lime juice over the top.

9. Ready to Serve: Arrange tacos on a serving platter, garnished with lime wedges for an extra burst of flavor.