In a large skillet, cook the chorizo over moderate heat until the fat has rendered, about 4 minutes. Using a slotted spoon, transfer the chorizo to a bowl. Drain off all but 1 tablespoon of the fat. Add the peppers, onion and garlic and cook until tender, about 5 minutes. Add the steak and chorizo and cook until the steak is no longer pink, about 3 minutes. Season with salt and pepper and transfer to a bowl to cool. Stir in the cheese and cilantro.