San Francisco is a good incubator. Ideas take root here, trends grab hold, and before you know it, citizens of our fair city are fairly obsessed. First it was the farmers market, then artisanal foods (charcuterie chief among them) and then coffee—which has reached such a fevered pitch it’s almost ridiculous. In our own pages we’ve written about baristas and roasters, about hi-tech siphons and fair-trade shade grown beans. I would have thought, really, that we have covered this particular topic from every possible angle.