Yulin tofu is the crown jewel of Shaanxi's northern plateau — a dense, springy pressed block made from local black soybeans, ground with the mineral-rich Puhui Spring water known locally as 'Peach Blossom Water,' and set with sour whey carried over from the previous batch rather than gypsum. The result possesses eight canonical qualities prized by Yulin cooks: yellow-cream in colour, balanced, clean-cutting, fine-grained, smooth, tender, resilient, and porous. It transforms across more than twenty-six documented preparations — braised, deep-fried, cold-dressed, or cooked in lamb broth.
Yulin tofu reportedly entered imperial notice in 1518, when the Zhengde Emperor of Ming inspected the Yulin garrison and a local official presented the local tofu as tribute; the emperor declared it surpassed anything in the capital, and the dish's fame spread across the region. Its distinctive character is inseparable from the Puhui Spring — called 'Peach Blossom Water' by locals — a natural mineral spring certified by China's State Bureau of Geology and Mineral Resources in 1988 as a premium mineral water, rich in strontium and metasilicic acid, classified as calcium-magnesium bicarbonate type. The eight-step production process — sun-drying, hulling, soaking, grinding, filtering, boiling, coagulating, and pressing — culminates in the pivotal coagulation step: sour whey from the previous batch is stirred in slowly, allowing resident lactic acid bacteria to gently lower the soymilk's pH and cause proteins to aggregate into a firmer, more elastic curd than calcium-sulfate precipitation achieves.
Dense yet yielding — the tofu holds firm against the chopstick and releases cleanly on the bite, leaving a faint tang from the sour whey, a lingering soybean sweetness, and a mineral finish from the spring water. It holds its structure through long braising without becoming waterlogged, yet collapses smoothly on the palate — the 'resilient and tender at once' paradox that local cooks capture in two of its eight canonical qualities.
Sour whey carries lactic acid bacteria from previous batches; as it is stirred in a thin stream into hot soymilk, the lactic acid gradually depresses pH toward the isoelectric point of soy proteins (glycinin and β-conglycinin, pI ≈ 4.5–4.8), triggering thermal denaturation and aggregation into a continuous three-dimensional protein gel. The mineral-rich spring water supplies calcium and magnesium ions that further cross-link the protein chains, building a denser, more elastic matrix than sulfate-set tofu. Because slow acidification proceeds over several minutes rather than seconds, larger and more uniform curds form, retaining just enough water to produce the characteristic 'tender yet resilient' texture.
Variations
Fried tofu cubes (炸豆腐) — deep-fried until golden, dipped in chili vinegar; red-braised tofu with pork belly in soy and shaoxing wine; cold-dressed slabs with sesame oil, rice vinegar, and scallion; lamb-broth hot pot tofu, the quintessential Shaanbei winter preparation; sun-dried pressed tofu strips (豆腐干) sliced thin for cold salads or stir-fries.
On the Palate
Where Yulin Pressed Tofu sits in the Chinese flavor cloud
Ingredients
Serves 4How it's made
8 steps · 30 min
- 1480 min
Soak black soybeans in cold water for 8 hours until fully swollen; drain and rinse.
- 220 min
Grind soaked soybeans in batches with 4 litres of mineral water to a smooth, fine slurry; filter through double-layered muslin, pressing the pulp to extract maximum soymilk; discard the okara.
- 315 min
Pour soymilk into a pot; bring to a full boil over medium heat, stirring constantly to prevent scorching; skim all foam thoroughly; reduce to the lowest possible heat.
Watch outSkim all the foam as the soymilk boils and stir constantly so it doesn't scorch — burnt-on milk clouds and taints the whole batch.
- 45 min
Strain 300ml of sour whey saved from the previous day's batch — it should smell pleasantly tangy from 24 hours of room-temperature fermentation; if starting fresh, substitute 300ml of strained natural yogurt whey.
- 515 min
Stir the soymilk in slow clockwise circles to form a gentle vortex; pour the sour whey in a thin, steady stream in three equal additions spaced four minutes apart, watching for white curds to bloom and the liquid to turn pale yellow.
Watch outPour the sour whey in a thin stream in three additions as you stir a slow vortex, watching white curds bloom and the liquid turn pale yellow — dumped in fast, the curd sets coarse.
- 610 min
Cover the pot immediately and leave completely undisturbed for 10 minutes — do not lift the lid.
- 720 min
Gently ladle the tofu curds into a muslin-lined wooden mold; fold the cloth neatly over the top and press with a 3 kg weight for 20 minutes until the block is firm and cohesive.
Watch outPress under weight only until firm and cohesive — over-press and it goes hard and dry instead of tender.
- 810 min
Unmold onto a board; cool to room temperature before slicing; reserve the pressed-out whey in a covered jar for the next batch's sour-whey starter.
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