Put the beef in the freezing compartment of the refrigerator for 20 minutes. This will harden the meat slightly for easier cutting. Then cut it into thin slices 4 cm 1½ in long. Put the beef slices into a bowl and add the soy sauce, rice wine, sesame oil, salt, pepper and cornflour. Mix well and let marinate for about 20 minutes.
Peel the cucumber, slice in half lengthways and, using a