The fave of Instagram foodies is a San Miguel staple.

The fave of Instagram foodies is a San Miguel staple.

The fever started in L.A. Then, with a boost last month from Eric Asimov in the New York Times, it became a frenzy.  I’m talking about birria. And you’re excused if you don’t know what I’m talking about. Because birria may be, not only the most unrecognized, but also...