Slice flank steak into thin strips.
Mix lime juice, soy sauce, oil, and spices.
Add garlic, whisk until marinade blends well.
Place steak in bowl, coat with marinade.
Cover and refrigerate for two hours.
Preheat grill pan or outdoor grill medium-high.
Grill steak strips for four minutes per side.
Grill onions and peppers until slightly charred.
Warm tortillas on skillet for one minute.
Let steak rest under foil for five minutes.
Slice steak across the grain.
Arrange beef, onions, and peppers on platter.
Garnish with fresh cilantro.
Serve hot with tortillas.