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Anchovies are salted heavily, whole or ground, and left to ferment; Phan et al. list 20–30 days under sunlight, and Vietnamese Wikipedia says the paste is ripe when it turns red. The bones may be removed or left in. At the table it is mixed with roasted rice powder (thính), pineapple, sugar and other seasonings into a dipping sauce.
No fixed amounts recordedNo tested recipe with amounts is given in the sources used here. Phan et al. list ground anchovy with salt, 20–30 days under sunlight and a 12-month shelf life. Vietnamese Wikipedia, an unsourced stub, says makers judge the fish-to-salt ratio by experience, about "one to three" depending on the season and the batch (it does not say which is the fish), and gives about three months of ripening, which is longer than the 20–30 days of Phan et al.
A high level, up to 25% w/w for long-life ferments such as mắm nêm[phan2024]
Thính (roasted rice powder), pineapple and sugar
Vietnamese Wikipedia's opening says the fermented fish is then blended with thính, pineapple and sugar; its method paragraph puts thính in with the salt before packing, and sugar, chilli and garlic after ripening[wp-vi]
Starter
spontaneous
Total time across the recorded steps: 13 months
Start
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What changes:Small anchovies are mixed with salt
Step 1 of 4
Salt the fish
Time
Not documented
Temperature
Not documented
Salt
up to 25 %
Reported
Acidity
Not documented
Which microbes the steps name, step by step
Lactic acid bacteria
Pediococcus pentosaceus
The anchovies are ground with salt, or packed whole. Output: salted fish.
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
Anchovies are salted heavily, whole or ground, and left to ferment; Phan et al. list 20–30 days under sunlight, and Vietnamese Wikipedia says the paste is ripe when it turns red. The bones may be removed or left in. At the table it is mixed with roasted rice powder (thính), pineapple, sugar and other seasonings into a dipping sauce. Made in 4 steps over 13 months. The longest step, keep, takes 12 months (Phan Thi Hang G 2024). Salt is up to 25 % (Phan Thi Hang G 2024). Pediococcus pentosaceus does most of the fermenting.
Phan et al. list 20–30 days of sun for mắm nêm against 12–18 months for nước mắm. It is eaten as a ground anchovy paste and finished at the table with roasted rice powder, pineapple and sugar.
Phan et al. class mắm nêm among Vietnam's long-life salty ferments, which keep three months to two years at ambient temperature because a high salt level, up to 25% w/w, holds back pathogens; their table gives mắm nêm a 12-month shelf life. The study gives that salt level for the class, not as a measurement of mắm nêm itself.
English Wikipedia lists mắm nêm as Cham in origin and, in its infobox note, quotes Tana Li's 1998 book on Nguyễn Cochinchina, which says the sauce "may actually have a Cham origin, according to some Vietnamese scholars". The same note quotes Vu-Hong (2016) and Vo (2011) for the same Cham link. The sources read here give no date or document for its first making, and the books themselves were not opened.