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Budu is a thick, cloudy anchovy sauce from the east coast of Peninsular Malaysia and southern Thailand. Whole anchovies are packed with salt at about two or three parts fish to one of salt and left for months in tanks or earthen jars until the flesh dissolves into a brown, salty liquid with grey fish solids.
Fully documentedSauces and condiments3 months – 12 months
Recipe
Amounts from a sourceRatios, not a fixed batch. A study sample of about 30 kg came from a Kelantan factory at 3 parts fish to 1 part salt.
Fresh anchovies (Stolephorus spp.)2 or 3 parts by weight
Total time across the recorded steps: 3 months – 12 months
Start
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What changes:Whole anchovies are mixed with salt and packed tight
Step 1 of 4
Wash the anchovies and mix with salt
Time
Not documented
Temperature
Not documented
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Micrococcus
Output: salted anchovies packed tight.
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
Budu is a thick, cloudy anchovy sauce from the east coast of Peninsular Malaysia and southern Thailand. Whole anchovies are packed with salt at about two or three parts fish to one of salt and left for months in tanks or earthen jars until the flesh dissolves into a brown, salty liquid with grey fish solids. Made in 4 steps over 3 months – 12 months. The longest step, ferment under a salt cap, takes 3–12 months (Sim K.Y 2015) and runs at 30–40 °C (Sim K.Y 2015). Salt is 20–25 % (Sim K.Y 2015). Micrococcus luteus and Staphylococcus arlettae do most of the fermenting.
Budu sits between a clear fish sauce and a fish paste. Unlike nam pla or patis it is not drained clear; the dissolved flesh stays in, so it is thick and cloudy.
Thai southern styleEaten with chilli, shallot, sugar and lime juice added.
Thai central style (khao yam)Boiled with lemongrass, galangal and bitter orange leaves, then decanted.
Safety
A Kelantan study linked falling bacterial counts late in fermentation to the high salt, 20–25 %. A 2009 USM thesis proposed quality limits for budu of salt at 15.0–33.0 % (w/v), pH 5.3–6.2 and histamine at most 50.0 mg/100 g. That histamine figure is looser than the 40 mg/100 g Codex sets for fish sauce, which it defines as a translucent liquid. Eight Malaysian budu samples averaged 187.7 mg/kg histamine (Saaid et al. 2009), which is about 18.8 mg/100 g. That mean is under both limits, but the abstract we read gives no single-sample figures. FDA says histamine, once formed, cannot be removed by heat.
Hazards the sources name: Histamine (eight Malaysian budu samples averaged 187.7 mg/kg); Staphylococcus aureus (listed among budu isolates).