4 L. of milk
4 tbsp of plain yogurt (as a starter)
Heat the milk in a sauce pan to 43c, (do not reach 45c because the starter will die and the process will fail)on the side beat the 4 tbsp of yogurt for about 1 minute and leave it out of the fridge so it is not too cold when you add to the milk .
Add the 4 tbs of yogurt to the milk and stir slowly until the yogurt mixed through the milk (for about 8 seconds ).
Cover the pan and wrap with a blanket to keep the temperature from dropping too fast keeping it non-disturbed overnight.
In the morning transfer the yogurt into apprpriate containers and place into the fridge.