Bring milk to a boil. Using a cooking thermomater, check whether the temperature reaches around 176-180 °F. This step is crucial as it will kill any unnecassary bacteria. Cool it down to 112-115’F. Set aside.
Remove 1/4 cup milk. Cool to room temperature and dissolve 1 tablespoon of yogurt without forming lumps.
Gently mix the yogurt mixture into the boiled milk. Pour into a glass jar or any container.
Store it at room temperature to ferment.
If living in a cold country, pre-heat the oven to 190F for 15-20minutes. Switch off the oven. Place the container over a baking tray and cover with a towel. The towel helps to retain the heat for a longer time. Place inside the oven and close the door. Let it ferment overnight.
Once set, transfer the container to fridge until ready to use.