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, whisking until smooth and fully blended.
04 - Stir the thinned starter mixture back into the remaining cooled milk, mixing thoroughly to ensure even distribution of the cultures.
05 - Pour the inoculated milk into a clean container or divide among individual jars. Cover loosely with lids.
06 - Place the containers in a warm environment — a turned-off oven with the light on, a yogurt maker, or a similar incubation spot — and let them sit undisturbed for 8 to 12 hours, until the yogurt has set to your preferred consistency and level of tanginess.
07 - Refrigerate the yogurt for at least 2 hours before serving. Store covered in the refrigerator for up to 1 week.