Add the thinly cut steak, Cayenne pepper, lime juice, lime zest, oregano and a pinch of sea salt to a bowl. Cover the bowl and leave to marinate for 1 hour in a cool place.
While the steak is marinating cut all the vegetables into thin strips.
Add the olive oil to a large frying pan over a high heat, add the steak and cook until the steak is sealed all over. Add the vegetables and turn the heat down. Cook until the vegetables are still slightly crisp. Add the coriander, stir in and remove from heat.
Serve with flat breads or tortillas, sour cream or crème fraiche, guacamole, mixed leaf green salad, chopped coriander and diced tomatoes.