Place cilantro stems, lime juice, a large portion of the olive oil and a large portion of the red pepper in a nourishment processor or blender. Mix until smooth. Pour blend in a dish and place steak over it. Coat meat with the blend and let remain for no less than 15 minutes. Expel steak from marinade (dispose of overabundance) and cook on a pre-warmed flame broil over high warmth for 4 minutes for each side or until cooked through. Cut daintily and place on a serving dish. Top with cilantro leaves, onion, garlic and staying red pepper. Shower with residual oil and present with lime wedges.