1 Trim the fillet of all silver skin and sinew. Roll the meat in a mixture of cracked szechuan pepper, black pepper and oyster sauce.
2 Tightly wrap the fillet in clingfilm to form it into an regular shape and seal in the marinade. Refrigerate for several hours.
3 Make a sauce by reducing a good liquid (not powder) beef stock by half or until it will coat a spoon. Add a decent slug of whiskey and check the seasoning. Keep warm.
4 Make a purée of golden kumara: boil peeled kumara chunks, dry, mash with butter and pass through a sieve or mouli. Season well with salt and pepper, keep warm.
5 Cook the trimmed asparagus spears in salted water. Drain and keep warm.