Use store bought plain yoghurt as a starter for the first time. I got one that says it has an active culture of Streptococcus thermophilus and Lactobacillus bulgaricus. After the first time use the homemade yoghurt as the starter.
- 4 of 1 litre mason jars in a pot that is shorter than the jars
- put sticks (i.e. wooden skewers or popsicle sticks) under the jars for thermal separation and to minimize blurping
- fill with 1% milk
- fill with water to well below lids
- bring to 180F (~50 minutes on small burner at high)
- remove from burner and let sit for 30 minutes
- carefully flush pot water with increasingly cold tap water
- let sit until cooled to 115F (~30 minutes)
- pitch starter at 25ml per litre and stir well
- put entire pot with water in oven
- keep at 110F for 6 hours
- refrigerate immediately
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Food Fermentation Technology - Yogurt
Formation and Physical Properties of Yogurt
Sensory Quality Aspects of Yoghurt