In a bowl, whisk together lime juice, olive oil, minced garlic, chili powder, salt, and pepper to create the marinade.

Place the flank steak in a resealable bag, pour the marinade over it, seal tightly, and marinate in the fridge for at least one hour.

Preheat the grill to medium-high heat (about 400°F).

Remove the steak from the marinade (discard any leftover marinade) and grill for about 6-7 minutes per side for medium-rare or until desired doneness.

Let the steak rest for 5 minutes on a cutting board before slicing against the grain into thin strips.

Serve hot with fresh cilantro on top.