Chinese · Anhui

Mao Doufu (毛豆腐) — Hairy Tofu: Mold-Ripened Tofu

Mao doufu (毛豆腐, literally hairy tofu) is a fresh tofu inoculated (accidentally or intentionally) with a white mold (Mucor genus, closely related to the mold used in some doufu ru fermentations) and allowed to grow a dense coating of white mycelium for 3-5 days at room temperature. The resulting tofu, covered in a thick white fur of mold, is then grilled or pan-fried until the mold exterior turns golden-brown and crispy while the interior becomes impossibly silky and slightly runny — the mold's proteolytic enzymes have broken down the tofu proteins during the fermentation, producing a texture midway between fresh tofu and custard. It is sold at street food stalls in the Huizhou region and at markets in Zhejiang.

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ServesFour portions

Total3–5 days fermentation; 8 minutes cooking

Sourced1of 5 in BC

Cook

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The Market List

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500 g

fresh firm tofu

cut into blocks approximately 5 × 5 × 4 cm

Origin · JapanT Amano Trading · Vancouver →

To serve (Anhui style)

1 tsp

fine salt

Your own market

1 tsp

dried chilli powder

Not yet stocked in British Columbia

To serve (Sichuan style, alternative)

2 tbsp

chilli oil

with sediment

Not yet stocked in British Columbia

For cooking

1 tbsp

neutral cooking oil

for pan-frying, if not using a grill

Not yet stocked in British Columbia

Each tap is counted, so the stockist sees the demand Provenance sends them.

The Method

Cut the fresh firm tofu into blocks of approximately 5 × 5 × 4 cm. Arrange in a single layer in a container. For controlled inoculation, place one piece of commercially obtained mao doufu with active mold growth alongside the fresh blocks; for traditional inoculation, leave the surface open to the warm environment. Cover the container loosely with a cloth or sheet of paper — the covering must allow air circulation while excluding direct contamination. Incubate at 18–22 °C for 3–5 days. At the close of fermentation, each block should be uniformly encased in a dense, white mycelium — thick, dry fur with no patches of black or green; the smell should be clean, faintly mushroomy, and mild.

Place the mold-covered tofu blocks on a hot grill or in a lightly oiled skillet over medium heat. Do not disturb them immediately: the white fur will first mat down against the surface as surface moisture drives off. Cook 3–4 minutes on the first side. The exterior is ready to turn when it is golden-brown and slightly crackled across the mold surface.

Turn each block and cook a further 3–4 minutes on the second side. The finished block is done when the exterior is golden-brown and crispy on both faces and the interior, when pressed gently, yields with almost no resistance — soft, warm, and approaching runny, the proteolytic fermentation having reduced the protein structure to a texture midway between fresh tofu and custard.

Transfer immediately to a plate. Serve Anhui-style with a pinch of fine salt and dried chilli powder dusted over each block, or Sichuan-style with a spoonful of chilli oil and its sediment spooned across. Eat at once; the silky interior stiffens as the blocks cool.

III

Quality Hierarchy

Reserve — Blocks sourced from an active Huizhou street stall or Zhejiang market, fermented with locally adapted wild Mucor strains accumulated in a dedicated incubation space over many cycles — the mycelium is densest and the proteolytic conversion deepest.

Estate — Fresh tofu inoculated from a live, commercially obtained mao doufu with vigorous mold growth, incubated under controlled temperature (18–22 °C) for the full five days — reliable fur coverage and a properly silky interior.

Market — Fresh firm tofu left in a warm, slightly humid domestic environment to catch natural airborne Mucor spores — fermentation is slower and less predictable but produces an authentic result when the full white coat develops.

House — Firm tofu pan-fried without fermentation — the textural transformation wrought by the mold's proteolytic enzymes is absent; the dish is cooked tofu, not mao doufu.

Sensory Tests

◇Sight. Each block is uniformly encased in a thick, white, dry mycelium with no patches of black, green, or pink mold — the coat is dense enough to obscure the tofu surface entirely.

◇Smell. The fermented blocks smell clean, faintly mushroomy, and mild — any sharp ammonia or sour odour indicates an unwanted secondary fermentation.

◇Sight. On the grill or skillet, the mold fur mats down, then turns golden-brown and slightly crackled — the colour change signals that surface moisture has been driven off and the exterior has crisped.

◇Touch. A gentle press on the cooked block meets almost no resistance at the centre — the interior is warm, yielding, and close to runny, confirming the proteolytic conversion is complete.

◇Where it lives or dies. The fermentation is where the dish lives or dies: if the mold coat is incomplete, patchy, or shows any colour other than white, the tofu has not been correctly inoculated and should not proceed to the grill.

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