Dude, seriously! I JUST wrote a Tumblr on this very subject!
Those of you who didn’t ask me this question are wondering why the hell would I make my own yogurt. Here is why.
- whole milk – preferably: organic, from pastured cows, low-heat pasteurized or raw, not homogenized
- yogurt starter (I use this one to be compliant with the Specific Carbohydrate Diet) – I believe this starter can also be used for coconut milk yogurt and nut milk yogurt! Check it out!
- some jars with lids (I use 5 old 16 oz almond butter jars with lids)
- a dehydrator (or some way you can keep the yogurt around 100°F for 24 -30 hours)
- a food thermometer (I use an Oxo Digital Instant Read Thermometer)
- a ladle (or some way to pour the yogurt into the jars)
- a pot and stove to heat up the milk (make sure it’s big enough for all the milk, with room left over)
- a large bowl in which the milk can cool (make sure it’s big enough to fit all the milk you are using!)
- a slightly larger bowl with ice in it that the bowl above can sit in to cool faster (optional, but really helpful)
- ice (two ice cube trays full or 40-50 cubes is usually good)
- 1/4 tsp measuring spoon
- a whisk to stir in the yogurt starter after the milk is cooled
Heat the milk over medium heat until it is 180°F. Do not let it boil or get hotter than that, because it will very likely boil over the top of the pot and make a huge mess all over your stove.
While the milk is heating up over medium heat on your stove, sterilize your jars, lids, ladle, milk-cooling bowl, measuring spoon and whisk. You can do this by dipping them in hot water (= or > 180°F), or steaming them for 3-4 minutes. [Since the cooling bowl will be big, you might want to just put it in the sink and pour in the sterilizing water and empty it after a few minutes.]
When the milk gets past 175 or so, shut off the stove. It will go up a few degrees by itself (plus, you don’t want to take the chance it will boil over!). Get your cooling area ready (preferably in the sink so you can catch spills – as long as nothing will splash in and contaminate your yogurt). Put the largest bowl in first, with the ice in it, then put the cooling bowl on top of that. Pour the milk into the cooling bowl.
When the milk gets down to around 100°F, get out your yogurt starter (it is supposed to be kept in the fridge) and put in the required amount and whisk it through. For the type of starter I use, and the amount of milk I work with (half gallon), it’s only an 1/8th of a teaspoon!
Fill your jars with the milk/starter and put the lids on. Put them in the dehydrator or whatever appliance you have that will maintain the 100°F heat, and let them sit, undisturbed for 24-30 hours. You want the yogurt to ferment for that length of time so the bacteria eats almost all of the lactose in the milk.
At the end of the 24-30 hours, take out your yogurt gently (bacteria don’t like to be disturbed), and place it in the fridge. The delicious fat layer will be on the top. Mix it in if you want it more homogenous. The yogurt will be fresh for about 10 – 14 days. Enjoy!