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Place a heavy base pot on high to medium flame range and pour 1 tablespoon of water in it. Then pour milk before water gets burnt and pan bottom becomes dry.
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Let it come to a boil. Turn off the gas. Leave it to reduce and reach the temperature between 100 to 115 Fahrenheit. You can put the milk pan in ice cold water bath to cool quickly.
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After few minutes, check the temperature, it should be around 115 Fahrenheit.
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Now Transfer the milk to a clean glass container.
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Now, whisk in one tablespoon of store-bought yogurt . At this point, you can also add a teaspoon of white sugar to help the bacteria grow.
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Cover the milk utensil with a clean kitchen tissue and keep it in oven undisturbed for 8-9 hours or overnight. To keep the temperature little warm keep the light on or you can heat the oven to full for 30 seconds when you put it in oven.
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In case you don't have oven, then try to find a warm and dry place to enhance the fermentation.
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You can see that yogurt has formed. To test that yogurt is done or not, you can put a wooden skewer in centre if it stand straight, it has formed.
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Now this is normal yogurt with whey (watery liquid in yogurt).
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For Greek yogurt
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Line a large fine-mesh sieve with 2 layers of cheesecloth and place over a large bowl. Spoon the yogurt into the cheesecloth, cover and refrigerate for 1 hour to 6 hours depending on how thick you want it.
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Yogurt can last from 1-3 weeks. After preparing it keep it refrigerated. It can last up to 2 months if it is frozen.