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Sữa chua is Vietnamese yoghurt, often made at home from sweetened condensed milk diluted with water and seeded with a little plain yoghurt, then set warm in small jars. As a yoghurt it falls under the Vietnamese fermented-milk standard TCVN 7030:2009, which follows Codex CXS 243 and requires the two yoghurt bacteria.
A short entry: the sources we found record only what is said here about Sữa chua itself. Its own sources do not record how it is made, so the steps and scenes below are those of Set yoghurt (industrial), the closest documented fermented milk ferment, shown as a guide to the method, not as a record of Sữa chua.
Short entryFermented milk
Recipe
No fixed amounts recordedNo tested home recipe was found that could be opened; the amounts vary by household.
Sweetened condensed milk
Diluted with hot and room-temperature water
Plain yoghurt
A few spoons as the starter
Starter
backslop: a few spoons of plain yoghurt
Total time across the steps of Set yoghurt (industrial): 4.2 h – 5.1 h
Start
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What changes:Milk powder is mixed in and the fat is broken into tiny globules
Step 1 of 5 · steps of Set yoghurt (industrial)
Standardise, deaerate and homogenise
Time
Not documented
Temperature
65–70 °C
Reported
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
S. thermophilus
L. delbrueckii
Output: standardised, homogenised yoghurt milk.
Flavour
Not documented
Texture
fat globules made smaller, so no cream layer forms in the cup
Colour
Not documented
Microbes at work in this step
none added yet
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
Sữa chua is Vietnamese yoghurt, often made at home from sweetened condensed milk diluted with water and seeded with a little plain yoghurt, then set warm in small jars. As a yoghurt it falls under the Vietnamese fermented-milk standard TCVN 7030:2009, which follows Codex CXS 243 and requires the two yoghurt bacteria. Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus, the cultures that define yoghurt in Codex CXS 243 does most of the fermenting.
Codex CXS 243 requires yoghurt to reach at least 0.6 % lactic acid and to hold live starter bacteria at 10^7 cfu/g or more until the end of shelf life. This defines the product and does not test a home batch.