We've come to the last of the "four Ms" needed to make everybody's favorite concentrated coffee kicker. And the last "M" is the romantic part, the human touch --
la mano, or the hand of the barista. Of course, as a professional barista trainer, I am inclined to think that this last "M" is the most important in the scheme of espresso-making. Call me biased, but seriously, you think this stuff is going to make itself?
The barista's role is perhaps more nuanced and significant even than it seems at first blush. For one thing, there's a good reason we're lumped in with all the fine-tuned mechanical details of the equipment and the blend: The barista is to be part artist, part machine. Just as
la macchina is designed to the same thing every time you turn it on, so too should the barista be as consistent as possible. He or she should understand the "how" and "why" behind every step in the process -- from grinding to extracting to drinking.
A good barista can make delicious coffee; a great barista can explain how it came to be that way.