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Inziangsang (fermented and dried mustard leaf)inziangsang
Inziangsang is mustard leaf (hangam) crushed, soaked in warm water, squeezed and pressed airtight into a container, where lactic acid bacteria ferment it for 7–10 days. The leaves are then sun-dried, to be cooked in soups. A review says the dried leaves are stored in a closed container for a year or more at room temperature. It is made much like gundruk.
Fully documentedVegetables11 days – 15 days
Recipe
No fixed amounts recordedHousehold tradition with no fixed amounts; the sources list only the leaf and warm water.
Total time across the recorded steps: 11 days – 15 days
Start
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What changes:Crushed mustard leaves soak in warm water
Step 1 of 4
Crush the leaves and soak in warm water
Time
Not documented
Temperature
Not documented
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Lactic acid bacteria
Lactobacillus plantarum
Lactobacillus brevis
Pediococcus pentosaceus
Leuconostoc fallax
Output: soft, crushed leaves.
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
Inziangsang is mustard leaf (hangam) crushed, soaked in warm water, squeezed and pressed airtight into a container, where lactic acid bacteria ferment it for 7–10 days. The leaves are then sun-dried, to be cooked in soups. A review says the dried leaves are stored in a closed container for a year or more at room temperature. It is made much like gundruk. Made in 4 steps over 11 days – 15 days. The longest step, squeeze out the water and press the leaves airtight into a container, takes 7–10 days (Swain M.R 2014) and runs at 20–30 °C (Swain M.R 2014). Lactobacillus plantarum and Lactobacillus brevis, Pediococcus pentosaceus, P. acidilactici and Leuconostoc fallax do most of the fermenting.
Ziang duiThe fermented extract, used as a condiment at home meals.
Safety
Swain et al. describe the leaves as pressed into the container and made airtight to keep the conditions anaerobic. After the 7-10 day ferment they are sun-dried for 4-5 days and kept in a closed container at room temperature for a year or more. No pH or salt figure is given. Fresh vegetables are low-acid foods (CDC), and Clostridium botulinum will not grow in food more acidic than pH 4.6 (WHO). So during the airtight 7–10 day stage the ferment relies on lactic acid reaching that level, which no source we read measures. The toxin cannot be seen, smelled or tasted (CDC). WHO says boiling destroys it, for example above 85 °C inside the food for 5 minutes or longer.