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Alcoholic drinks from Vietnam

Rượu nếp, rượu nếp cẩm and rượu đếrượu nếp

Cooked glutinous rice mixed with a crumbled yeast cake (bánh men) ferments in a few days into rượu nếp, a sweet, mildly alcoholic rice eaten with its juice; in the south, as cơm rượu, it is made into balls of white glutinous rice in a mildly alcoholic rice wine. Left longer, the rice mash is distilled in a simple still into rượu đế, the clear rice spirit of the countryside.

Fully documentedAlcoholic drinks10 days – 15 days

Recipe

Rượu nếp, rượu nếp cẩm and rượu đế, a photo from Wikimedia Commons
Photo: Viethavvh at vi.wikipedia, Public domain, via Wikimedia Commons
No fixed amounts recordedThe sources give no recipe weights. A Cần Thơ study describes cơm rượu as cooked glutinous rice cooled and incubated with the yeast cake for 2–3 days. For rượu đế, a survey of three upland districts of Bình Trị Thiên describes rice cooked with about its own volume of water and mixed with crushed yeast cake, with no fixed weights.
Glutinous riceCooked and cooled; for the spirit, rice is washed two or three times and cooked with about its own volume of water[thanh2024][hue2024]
Bánh men (yeast cake), ground fineSprinkled over the cooled rice and mixed in by hand or chopsticks; no fixed weight is given in the sources used[thanh2024][hue2024]
Banana leafWikipedia says rượu nếp is steamed in a banana leaf[WP:Rượu nếp]
Starterkoji/qu/mold-starter (bánh men, a rice yeast cake of moulds and yeasts)

Total time across the recorded steps: 10 days – 15 days

Start
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What changes: Glutinous rice is cooked until soft

Step 1 of 5
Wash and cook the glutinous rice
Time
Not documented
Temperature
Not documented
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Yeasts
Moulds
Saccharomyces

For the spirit, the rice is washed two or three times and cooked with about its own volume of water. Output: cooked glutinous rice.

Flavour
Not documented
Texture
Not documented
Colour
Not documented

Microbes at work in this step

Not documented for this step.

Method

Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source

At a glance

Cooked glutinous rice mixed with a crumbled yeast cake (bánh men) ferments in a few days into rượu nếp, a sweet, mildly alcoholic rice eaten with its juice; in the south, as cơm rượu, it is made into balls of white glutinous rice in a mildly alcoholic rice wine. Left longer, the rice mash is distilled in a simple still into rượu đế, the clear rice spirit of the countryside. Made in 5 steps over 10 days – 15 days. The longest step, ferment longer for spirit (rượu đế), takes 8–12 days (Nguyễn Văn Huế 2024) and runs at 25–35 °C (Nguyễn Văn Huế 2024). Yeasts and moulds, 3.1 × 10⁶ to 2.0 × 10⁷ CFU/g in cơm rượu; 15 yeast and 5 mould strains were isolated from the starter and the cơm rượu and Saccharomyces yeasts isolated from bánh men; in a laboratory trial, selected strains made 8.6 % (w/v) ethanol from saccharified glutinous rice liquid in 5 days at 30 °C do most of the fermenting.

Key numbers
Main step8–12 daysReported[hue2024]Ferment longer for spirit (rượu đế)
Temperature25–35 °CReported[hue2024]Ferment longer for spirit (rượu đế)
AciditypH 3.9–4.5Measured[thanh2024]Wrap and ferment sweet (rượu nếp, cơm rượu)

What makes this one different

Unlike rượu cần, which is drunk from the jar through tubes and never distilled, rượu nếp is eaten as sweet fermented rice after a few days, and rượu đế is the same kind of mash distilled into spirit. Both start from cooked rice and a bánh men starter rather than a leaf starter.

Related ferments

Variants

  • Rượu nếp cẩmMade from purple-black glutinous rice; deep purple-red.
  • Rượu nếp thanBlack glutinous rice wine, not distilled; the liquid and the fermented rice are blended together.
  • Cơm rượu (southern)Balls of white glutinous rice in a mildly alcoholic rice wine, according to Wikipedia.

Made the rượu nếp, rượu nếp cẩm and rượu đế way

Other rượu nếp, rượu nếp cẩm and rượu đế kinds

Made the same way, each with what its own sources record.

Rượu Phú Lộc (Phú Lộc village rice spirit)rượu Phú Lộc

Alcoholic drinks from Vietnam

Rượu Phú Lộc is a single village's distilled sticky-rice spirit, made with a traditional strain of yeast; the residue of distilling was fed to pigs.

Sources: Wikipedia; Difford's Guide; Doctors Without Borders (MSF)

Safety

The yeast cake shapes how much methanol, aldehydes and furfural form during fermentation. Household distillation varies batch to batch with the weather, the cook and crude stills, and some household spirit is of low quality. Do not assume any of it is free of methanol. Trial batches of leaf-starter spirit in the Huế book all held some (44.4 mg per litre of pure alcohol in one 40 kg batch), with far more from households' own yeast cakes than from a newly developed one. In a 2019 pilot in 20 Phú Thọ households, 17 rice-spirit samples held methanol, up to 37 mg/L; the authors judged that too little to cause toxicity in their study, which they said supports methanol added after production as the main source of mass poisonings. WHO also says outbreaks often occur when illegally produced drinks are adulterated with it. Methanol cannot be tasted in a drink, and poisoning can blind or kill. Avoid unlabelled spirit from a seller you do not know. A home still gives no way to test what it makes.

Hazards the sources name: Bacillus, 1.00–1.98 log CFU/g in the same samples, possibly contaminants; total coliforms and E. coli were below 3 MPN/g; Methanol, 44.4 mg per litre of pure alcohol in one trial batch of leaf-starter rice spirit (rượu men lá, a related spirit).

History and sources

Every number is labelled with how it is known. How this atlas is made

History
The sources we found do not record its history.
  1. [hue2024] Nguyễn Văn Huế 2024, Kỹ thuật sản xuất rượu men lá (Techniques for making leaf-starter rice wine), reference book, Hue University Pressbook
  2. [thanh2024] Hoàng Tuấn Thanh, Huỳnh Quốc Huy, Nguyễn Thị Ngọc Anh, Lưu Minh Châu, Nguyễn Ngọc Thạnh, Bùi Hoàng Đăng Long and Huỳnh Xuân Phong 2024, Evaluation of quality and isolation of yeast and mold strains from fermented glutinous rice in Can Tho city, Can Tho University Journal of Science 60 (natural sciences special issue), 461–472paper
  3. [dung2009] Ngô Thị Phương Dung 2009, Fermentation ability and ethanol tolerance of yeasts from bánh men, Can Tho University Journal of Science 11b, 374–382 (abstract)paper
  4. [WP:Rượu nếp] Wikipedia, Rượu nếp (outline only)wiki
  5. [lao2019] Lao Y., Pham B.D., Le H.T., Nguyen Van H., Hovda K.E. 2019, Methanol content in homemade alcohol from a province in North Vietnam, Drug and Alcohol Review 38(5):537–542 (abstract)paper
  6. [who-infosan2020] World Health Organization 2020, INFOSAN Quarterly Summary 2020 no. 2, methanol poisoning outbreaks linked to adulterated alcoholic beverages (general safety text only)gov
  7. [msf-methanol] Doctors Without Borders (MSF), Q&A Methanol Poisoning, fact sheet (general safety text only)other