Every now and then it's good to notice you've been talking a particular talk but not walking the walk: I've been saying for a long time that milk or cream just left out rots if it's pasteurized. But raw milk naturally ferments. Have I ever just let it do that? On the counter and unattended? Last week I was making butter, which ended up going into a bizarre 16th century recipe I'm talking about next week at a cookbook conference in NY. Let me just say this recipe I'm pretty sure has never been translated into English and I doubt has been cooked using original techniques, at last for 400 years or so. So I had some raw cream left over. I just left it out. And in one week this is what happened. Not very sour, rather pleasant and buttery. I'm not sure if it's creme fraiche or clabbered cream or what, but it did it to itself. GOT to love bacteria!