China (origin); Japan (national winter vegetable since Edo period); winter hot pot essential
Hakusai (Chinese cabbage, Brassica rapa pekinensis) is Japan's most important winter vegetable—a substantial, mild-flavored, leafy brassica that functions as the primary vegetable in winter nabe hot pot, as the base for numerous tsukemono (pickled preparations), and as a standard vegetable in miso soup. While Korean cuisine transformed hakusai into kimchi with fermentation and chili, Japanese hakusai pickles (hakusai-zuke) are typically salt-only preparations—fresh leaves are massaged with salt, pressed under weight for 1-3 days, producing a clean, mild, lacto-fermented pickle with a pleasantly sour finish. The simplest form (ichiya-zuke, one-night pickle) uses only salt and produces a lightly salted, barely fermented pickle ready the next day. For longer fermentation (3-5 days), the natural lactic acid bacteria produce more acidity, resembling sauerkraut in its lactic quality. Japanese adaptations of Korean kimchi also exist—adapted kimchi using hakusai with chili and gochugaru has become extremely popular in Japan under the name kimuchi (キムチ). In hot pot, hakusai adds bulk, mild brassica sweetness, and absorbs surrounding broth flavors; its natural water content adds moisture to the pot. Hakusai is at peak quality from December through February when cold temperatures produce sweetest flavor.
Mild sweet brassica; clean lactic sourness in salt pickle; mild and neutral in hot pot where it absorbs broth
{"Salt-only ichiya-zuke is the canonical Japanese preparation—no chili, no garlic, purely brassica-lactic","Salt percentage: 2-3% of hakusai weight for quick pickles; 1.5% for longer fermentation","Cold temperature fermentation (below 10°C) produces cleaner, milder lactic sourness","Winter peak December-February when cold produces sweetest, most moisture-rich hakusai","In hot pot: add in the last 5-10 minutes—long cooking causes complete breakdown"}
{"For ichiya-zuke: cut hakusai in quarters, salt 2% by weight, massage, pack in bag with weight, overnight","Add yuzu zest and a piece of dried chili to the salt pickle for subtle fragrance and mild heat","The liquid expelled by salt pressing (hakusai-juice) is excellent for miso soup or pickling base","Compare Japanese hakusai-zuke vs Korean kimuchi side by side for the clearest lesson in cultural adaptation"}
{"Not pressing enough weight during pickling—gas escapes without compression can cause uneven fermentation","Over-salting which produces excessively salty pickle requiring rinsing that washes out flavor","Adding hakusai to hot pot at the start causing it to dissolve into the broth","Purchasing in summer when the cabbage is watery and less sweet"}
Shizuo Tsuji — Japanese Cooking: A Simple Art