Thin shreds of potato stir-fried quickly so they stay crunchy rather than soft, seasoned with salt and often a little vinegar, scallion, green pepper or dried chili. No meat.
Small restaurants always have vinegar-stir-fried potato shreds on the menu.
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A benchmark of Chinese knife skills - whether a cook can cut true 丝 (threads rather than sticks) is a classic test in cooking schools. The dish is usually stir-fried with vinegar and chili for a crunchy texture.