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Vegetables from Nepal, Sikkim and Darjeeling

Sinkiसिन्की

Sinki is radish root that is wilted, shredded and fermented with no salt, in a sealed jar or a clay-lined pit, until lactic bacteria make it sour. The sour shreds are then sun-dried, and the dry sinki keeps for a long time as a base for soup and pickle.

Fully documentedVegetables13 days – 3.1 months

Recipe

Sinki, a photo from Wikimedia Commons
Photo: Eastern Himalayas, CC BY-SA 4.0, via Wikimedia Commons
No fixed amounts recordedThe sources give no fixed batch size. They describe radish roots fermented without salt.
Fresh radish rootsWilted in the sun, then shredded[fao134]
No saltSinki is a non-salted ferment[s1]

Total time across the recorded steps: 13 days – 3.1 months

Start
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What changes: Fresh radish roots wilt in the sun

Step 1 of 6
Wilt the radishes in the sun
Time
24 h – 2 days
Reported
Temperature
Not documented
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
L. fermentum
L. brevis
L. plantarum

Output: wilted roots.

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

Sinki is radish root that is wilted, shredded and fermented with no salt, in a sealed jar or a clay-lined pit, until lactic bacteria make it sour. The sour shreds are then sun-dried, and the dry sinki keeps for a long time as a base for soup and pickle. Made in 6 steps over 13 days – 3.1 months. The longest step, ferment, takes 12 days – 3 months (Tamang J.P. and Sarkar P.K. 1993) and runs at 30 °C (Tamang J.P. and Sarkar P.K. 1993). Lactobacillus plantarum, the dominant species, found in every one of 40 samples and Lactobacillus brevis, also found in every sample do most of the fermenting.

Key numbers
Main step12 days – 3 monthsMeasured[s1][fao134]Ferment
Temperature30 °CMeasured[s1]Ferment
AciditypH 6.7 → 3.3Measured[s1][fao134]Ferment

What makes this one different

Sinki uses no salt at all, unlike most vegetable ferments. It relies on a fast drop in pH and then drying to keep, as gundruk does with leaves.

Related ferments

Variants

  • Pit sinkiFermented in a clay-lined pit for 2–3 months instead of a jar.
  • Sinki pickleThe fermented radish is eaten as a pickle instead of being dried for soup.

Safety

With no salt, safety depends on souring fast; the pH fell from 6.7 to 3.3 under the optimized conditions. Drying the sour shreds then keeps them stable. Souring below pH 4.6 is what holds back Clostridium botulinum in a sealed jar or pit. The 3.3 figure comes from the jar method, and the sources we read give no pH for the pit. Snyder et al. say a vegetable ferment that fails to reach below pH 4.6 should be discarded, and that in some low-salt ferments the pH can rise back above 4.6. CDC says the toxin cannot be seen, smelled or tasted, so taste is no test of safety.

History and sources

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

FAO's 1998 bulletin calls sinki one of the most popular pickles in Nepal and says it is eaten in India, Nepal and parts of Bhutan. It records two ways of making it, a jar method and a clay-lined pit method (citing Karki 1986) (Battcock and Azam-Ali 1998).

Starter
The sources we found do not say how its fermentation begins.
  1. [snyder2020] Snyder A., Breidt F., Andress E.L. and Ingham B.H. 2020, Manufacture of traditionally fermented vegetable products, best practice for small businesses and retail food establishments, Food Protection Trends 40(4), 251–263paper
  2. [cdc-prev] CDC, Preventing botulism (botulism prevention page), read 2026-11gov
  3. [s1] Tamang J.P. and Sarkar P.K. 1993, Sinki, a traditional lactic acid fermented radish tap root product, Journal of General and Applied Microbiology 39(4), 395–408 (abstract)paper
  4. [fao134] Battcock M. and Azam-Ali S. 1998, Fermented fruits and vegetables, a global perspective, FAO Agricultural Services Bulletin 134, section 6.3.3 Sinkigov
  5. [s2] Wikipedia, Sinki (food) (outline only)wiki