Thin egg noodles stir-fried dry with bean sprouts, onion and scallion in soy sauce with a little sugar, usually with little or no meat. A Cantonese and Hong Kong dish, common at dim sum and breakfast.
Soy sauce chow mein uses only bean sprouts, scallions and soy sauce, and it's simple to make.
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豉油 is the Cantonese word for soy sauce, 酱油 in standard Mandarin. 豉油皇 "king of soy sauce" is soy sauce cooked with sugar into a sweeter seasoning, not a brand.