Raw Vegetables with Soybean Dip

Eating raw vegetables dipped in fermented soybean paste (生菜蘸酱) is a Manchu custom carried down from the Jurchen hunting-and-fishing peoples of the Changbai Mountains, whose cooking leaned on roasting and on house-made paste (大酱 / 盘酱). Manchu households made their own paste as a year-round staple and ate it with raw scallion, baby cabbage, cucumber, and green chili. When the Manchus founded the Qing and moved south of the pass, the dish and its paste were kept on the imperial table so descendants would not forget the plain food of their ancestors — provincial folklore offices in Heilongjiang and the Jilin Manchu Museum both record raw-vegetable-and-paste eating as a defining Manchu foodway. The exact inventor and date are unrecorded, as with most folk customs. The restaurant platter form is a much later, contemporary name: 大丰收 ("Great Harvest"), after the autumn harvest it evokes, heaping the seasonal vegetables together with the bowl of dip.

The pleasure is contrast and crunch. A raw scallion is sharp and watery and bites back; cucumber and chicory are cold and snapping; lettuce leaves are tender and faintly sweet. Against all of them sits the paste — dark, dense, deeply salty, with a mellow fermented funk and a slow umami that coats the tongue. You scoop or wrap rather than soak: too much paste and the vegetable disappears under salt; too little and it tastes of nothing. Good 大酱 is thick enough to cling to a scallion without dripping, brown and glossy, savory rather than merely salty. A thin, raw-smelling, or sharply sour paste means it was under-fermented or has spoiled, and a limp, warm, watery platter has lost the entire point — the vegetables must be crisp and cold.

The vegetables are raw, so the only thing actually "cooked" here is the paste, and it is cooked by microbes. Soybeans are boiled, mashed, and pressed into bricks (酱块) that are hung to dry and seeded with mold; the workhorse is Aspergillus oryzae (米曲霉), which secretes proteases and amylases. By Dongbei custom the bricks are then broken into brine only on set days of the fourth lunar month and left to ferment and mature through the summer sun. During this long maturation the proteases hydrolyze soy protein into free amino acids; glutamic acid and aspartic acid among them are the savory ones — glutamate is the same compound that gives MSG its taste — which is why a spoonful of paste reads as deep umami rather than flat salt. The heavy salt (commonly around 17-20%) is not just seasoning: it suppresses spoilage and pathogenic bacteria so the slow enzyme work can proceed safely. Raw vegetables contribute the counterpoint — turgid, water-filled cells that snap and stay cold — and a brief blanch is used only for tougher seasonal greens, just long enough to soften without going limp. When the paste is built into 鸡蛋酱 or 肉酱, egg or pork fat carries the salt and rounds the edge, but the umami still comes from the fermented base.