Heat a large frypan over medium-high heat. Fry the steak strips, stirring constantly, until browned on the outside and cooked through but not too firm, about 5 minutes. Season with salt and pepper. Remove to a plate and keep warm.
Heat the oil in the frypan and quickly fry each tortilla on both sides until lightly browned and flexible. Set aside and keep warm.
Place tortillas on a plate and top with steak strips, onion, jalapeno and coriander to taste. Squeeze lime juice over. Wrap and eat.