Sprinkle fillets evenly with salt and pepper. Place sesame seeds, crushed red pepper, and torn nori sheets in the bowl of a mini food processor, and process until finely ground. Transfer to a shallow dish; dredge steaks in nori mixture. Heat olive oil in a large cast-iron skillet over medium-high. Add steaks to pan; cook 3 to 4 minutes on each side or until desired degree of doneness. Let steaks rest on a cutting board 5 minutes before slicing.