Shell the prawns, make slits at the back to remove intestine. Rub with salt and cornflour lightly, rinse well and pat to dry. Marinate with pepper and leave for 5 minutes.

• 把中虾去壳，开背取肠，擦少许盐及生粉，冲净后抹乾，以胡椒粉调味后腌一会。