Mix the sweet potatoes, cornflour, salt and pepper in a bowl. Add the oil, mix, spread on a baking tray lined with baking paper. .
Approx. 40 mins. in the centre of an oven preheated to 220°C. Turn the sweet potatoes once during cooking.
Remove the meat from the fridge approx. 30 mins. prior to cooking. Heat the clarified butter in a frying pan. In batches, fry the rump steaks for approx. 1 min. on each side, reduce the heat, allow the meat to cook through for approx. 1 min. each side. Remove, season with salt, cover and set aside.
Wipe the cooking fat from the pan, add the honey, water and wasabi paste, loosen any bits that have stuck to the pan, reduce the sauce a little, season with salt. Serve up the sweet potatoes and meat, with the sauce on the side.