I was thinking that red cabbage might be the canary of our civilisation. Or possibly that its mysterious absence from the shelves is linked to the German e.coli outbreak. The Germans, I believe, love their red cabbage. I cannot think of any other reason for its disappearance - and nobody has been able to suggest an explanation apart from e.coli.
Anyway tonight I found some in Tesco's - there were two red cabbages on the shelves. They were organic. But that's good news. They say you should mix red, orange, green and yellow fruit and vegetables in your diet to get a full range of nutrients. Well, red cabbage is the only red fruit or vegetable I can eat.
So maybe the canary has not croaked yet.