Meanwhile, various friends of mine have posted and blogged about making their own yoghurt, using some commercial, live-culture yoghurt as a starter. So, Thursday night, I gave it a whirl. I started with a quart of whole milk ($1.19 at the supermarket) and the last 1/4 cup of commercial yoghurt. The various web sites that I read made heating the milk seem like a big production, which put me off for a bit, until I realized that nobody has double-boilers anymore. Except me. So, I put the milk in the top part of my double-boiler, heated it to 180°F, let it cool to 110°F, put it in a larger bowl, and mixed in the starter. I had already preheated the oven to 110° and turned it off. So, I put the bowl of yoghurt in the oven, turned on the oven light, and left it to sit overnight.
And, in the morning I had yoghurt. I brought a little cup of yoghurt in to work for my afternoon snack. By mid-afternoon, it had firmed up nicely. And it was delicious.