01 - Pour the milk into a saucepan and warm gently over medium heat, stirring occasionally, until it reaches 185°F. Do not allow the milk to boil.
02 - Remove the saucepan from heat and let the milk cool to between 110°F and 113°F.
03 - In a small bowl, combine the yogurt starter with a few tablespoons of the cooled milk and whisk until smooth and fully blended.
04 - Pour the starter mixture back into the remaining cooled milk and stir thoroughly to ensure even distribution of the cultures.
05 - Divide the mixture among clean containers or individual glass jars. Cover loosely with lids.
06 - Place the containers in a warm environment — such as a turned-off oven with the interior light on or a dedicated yogurt maker — and let incubate for 8 to 12 hours, or until the yogurt reaches your desired thickness and tang.
07 - Transfer the set yogurt to the refrigerator and chill for at least 2 hours before eating.
08 - Keep refrigerated for up to 1 week.