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A couple of years ago, I started making yogurt. I could no longer bear dealing with all of those little plastic bowls and lids! I didn't want to buy a machine so initially I did it without an additional heat source. I just left it in the bowl, covered with a towel, and sat it in a warm place for at least 12 hours. Not always easy to do because we keep our house pretty cool in the winter. I then moved to placing it in the oven with the light on since we have an electronic start to ours so no pilot light. Results were pretty mixed. Sometimes it worked okay, and others not. Even when it was okay, it was never thick like I wanted it, but it was good and usable for breakfast, in baking, and as a sour cream substitute.
Then about a year or so ago a friend told me how she cultured hers in glass jars in a cooler with a heating pad. I tried it and never turned back. It works really great! Results are fantastic and in half the time, although I do tend to make it and leave it to culture overnight most of the time just for convenience.
There have been a few failures but I can only think that they may have been caused by some oil residue inadvertently left on the surface of my sauce pan or a measuring cup. Even though all of your utensils are clean, it never hurts to give them a good wipe before starting. Don't use metal utensils to stir or measure the starter or to stir or ladle the milk once the starter is in it. I do use a stainless pan to boil the milk, but after that it comes in no contact with metal.
1/2 gallon of whole milk 1 cup heavy cream 4 oz. plain yogurt with active cultures for a starter (some people use as little as 2 T. for a starter but I find this amount works better for me and this method.)
In a large sauce pan, bring milk to a boil, stirring constantly. Remove from heat and stir in the cream. Pour into a stoneware or glass bowl and allow to cool to 100 degrees. Set up your incubator by wrapping a heating pad in a towel, place it in the bottom of a picnic/camping cooler so it lays flat and turn it on high.
With a wooden spoon, stir your yogurt starter a little so it's smooth and then stir in a ladle of the warm milk to temper it. Stir the yogurt starter into the warm milk.
Ladle into one-pint glass jars with lids. Mason jars work really well, as do glass peanut butter jars. Sterilization is not necessary, just clean jars and lids. Seal the jars. (The jars do have metal lids but most of the insides are coated so no problems there. Either way, the yogurt doesn't touch the lid while culturing so even non-coated lids don't cause a problem.)
Place the sealed jars in the cooler, upright, on top of the towel-wrapped heating pad and cover with a couple of dish towels. Allow to culture for 5-6 hours without being disturbed.
Allow to sit on the counter to cool off for a little while, and then refrigerate. This makes about 5 1/2 pints, which we use inside of a week, and could really use more, actually.
Save some of your homemade yogurt to start the next batch.
You can also do this with goats milk. Once it's done, I like to make soft spreadable cream cheese with it. It's really, really easy and wonderful, too!
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