Cian Traynor, a true coffee lover learning the art of crema from three very different teachers. Photograph: Alan Betson

Midway through an intensive barista training class, a man who calls himself “the happy coffee guy” inspects my umpteenth espresso of the day. S(...)

Midway through an intensive barista training class, a man who calls himself “the happy coffee guy” inspects my umpteenth espresso of the day. S(...)