12 hours of "cooking" the yogurt or 12 hours of draining?
My first batch was ~6.5 hours in the sous vide @ 115*F, and drained for ~1.5 hours.
It's very good. A little thicker than I wanted, but not nearly as "bitter" as normal store bought plain greek yogurt (probably because I only "cooked" for ~6.5 hours).
Also, ended up losing almost half the volume to whey....if I only wind up with ~2 qts of yogurt per gallon of milk, I probably won't bother (from a cost savings standpoint) anymore.
I don't sous vide (much) since it requires me to dig out my brewing eqmt. That would be a lot of work for some yogurt. The way I do it is super fast and painless, and happens while you're sleeping.
My very simple yogurt process. Nothing new here, and I know you already know this AZ, but for completeness:
Ingredients:
- Milk (I use 2%, but you can use everything from skim to whole to almond to whatever)
- 1 tblsp (or more) of yogurt with live cultures (most yogurt, especially greek, is live)
Process
- Heat milk to 180F (best to use a dbl boiler, or put a pot into a pan of water, so as to avoid scorching the milk; stirring continuously over low heat works)
- Cool to 100-110F. Don't want to kill the cultures in the yogurt!
- Drop a tbsp or more of commercial yogurt (or from your previous batch) in there and stir. Choose a plain, unflavored yogurt you like; the new yogurt will taste identical to what you use, assuming the cultures in it were alive. If you want Greek, get a little thing of greek yogurt and dump it in.
- Turn oven on any temperature for about 1 minute, then off again. Then turn on the oven light. This will keep the oven warm all night.
- Put the pot with milk in the oven. Put a lid on it.
- Next morning, remove and dump into sieve. It's yogurt now, but if you want Greek yogurt then it needs to be thicker.
- Refrigerate, and leave in sieve 6-12 hours. It will get thicker and thicker as the whey drips out of it, and eventually become the consistency of sour cream.
For tzatziki sauce, blend a cup of the yogurt above with a peeled/seeded cucumber, couple of garlic cloves, and a couple of tbsp of lemon juice. Takes 1 minute.