To infuse even more flavour into the beef, marinate the fillet in the refrigerator overnight.
Method
Rub the fillet with sesame seed oil and season with salt and freshly ground black pepper.
Heat a large frying pan over a high heat and evenly brown the beef for 1 minute on each side. Sear the ends for only a few seconds to seal in the juices. It should be rare on the inside.
Remove from the pan and allow the fillet to rest on a chopping board for 5 minutes whilst you prepare the marinade.
To make the marinade mix together all the marinade ingredients in a bowl until well combined.
Transfer the beef to a large zip lock bag, add the marinade mixture and turn to coat. Place in the refrigerator for 2 to 4 hours to marinate, the longer the better.
Thinly slice the fillet and arrange it on the cucumber slices. Top with the carrots, radishes and a garnish such as micro herbs or sliced spring onion.
Drizzle over some of the marinade and pour the remaining marinade sauce into a small bowl for dipping.