[Jamestown1630]

Well, it sounds good; but you have to start with Icelandic Yogurt, to make Icelandic yogurt?

I guess it’s like sourdough - they used to use one of the named, long-lived ones, carried on for decades...

(I seem to recall a ‘Henry’.)

[Harmless Teddy Bear]

Yep. Either that or you can get the cultures at a specialty shop. But getting a container of Icelandic Yogurt is cheaper and easier.

And you only need one to make yogurt forever.