Pour 8 cups of milk (I use whole milk) into your crockpot. Cover and set on medium heat (I set it on 8 hours) for 2 1/2 hours. After 2 1/2 hours, turn the crockpot off and let it sit for 3 hours. After 3 hours, stir in with a wooden or plastic spoon 1/4 cup of organic, plain whole milk yogurt (like Stonyfield). Cover the crockpot and wrap it in a towel. Let it sit for 8 hours. Voila!
1. This yogurt turns out a bit runnier than store bought yogurt. You can drain some of the whey by pouring the yogurt into a muslin-lined collander. The whey is good for soaking grains, adding to unsweetened lemonade for a protein kick, or even dumping it into your toilet or compost pile for added beneficial bacterias.
2. You can use this yogurt to make additional batches of yogurt, but up the mix-in to 1/2 a cup of homemade yogurt. The yogurt culture will eventually weaken this way, so I recommend only up to 3 times before buying another container of Stonyfield and starting fresh again.
3. If you're not used to plain yogurt, try adding a bit of honey or some fresh fruit. It doesn't take long to develop a taste for the yogurt. If you're used to Yoplait or other highly sweetened and artificial yogurts, it may take longer.