Whisk sifted potato starch and xanthan gum with a bit of cold milk until dissolved. Then, add the mixture to a saucepan along with the remaining milk.
Warm the milk over low heat until it reaches the temperature of 85°C (185°F).
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{{/ items}} {{^ items}} {{/ items}}Allow the milk to cool down to 45°C (113 °F) in a clean bowl. Now, scoop out a ladle of milk and dissolve the starter culture in it before adding it back to the bowl.
Divide the milk among sterilised jars and incubate them in a hot water bath between 40 and 45°C (104-113 °F) for 12 hours. Wrap in cling film and cover with a blanket. Check the water hourly and replace it if it gets below that temperature.
Finally, refrigerate the yogurt for 6 hours before serving.