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Cut the beef as evenly as possible into very fine strips, discarding any fatty or grisly bits. Ideally, the strips will all be about 2-inch (5cm) long.
This recipe is a common home-cooked dish in Sichuan. Using celery, the texture is much improved if you sprinkle the strips with a little salt and leave them for 15-30 minutes to drain out excess water. Fleshy vegetables are best stir-fried in advance for a minute or two over a moderate heat, to ‘break their rawness’: they can then be added to the meat at the last minute. You can substitute chicken or beef for the pork in the above recipe if you like.