In a large pot, bring the milk up to 180 degrees Fahrenheit. Remove from heat and cool to 110 degrees Fahrenheit.
1 gallon milk
In a separate bowl, mix 1/2 cup organic yogurt with 1 cup of the warm milk, then pour the mixture into the rest of the milk, mixing well. If you want to make vanilla yogurt, now is the time to add 2 tablespoons homemade vanilla extract.
1/2 cup organic yogurt
Pour the milk into sanitized jars and put the lids on loosely. Keep at 110 Fahrenheit for 6 hours without mixing, stirring, or moving if possible.
There are a few ways to do this (Choose one):
1. Put in a yogurt maker that keeps them at 110 degrees Fahrenheit.
2. OR Put the jars in a large pot of water on the stove that is already at 110 degrees Fahrenheit and wrap towels around it to keep warm. I’ve done this before and it stays warm for a very long time. You just need to check occasionally and turn the burner on for a minute or two (REMOVE THE TOWELS FIRST) if it cools down too much. Watch carefully.
3. OR Put the jars in the oven with the light on and place a candy thermometer on the rack so you can see the temperature. This usually stays at 110 degrees Fahrenheit for about 4 of the 6 hours. If you turn the oven on, watch it very carefully.