The Reason Your Group Head Temperature Drops Mid-Shot
There I was, standing in my kitchen at 7:00 AM, pajamas on, eagerly watching a gorgeous stream of tiger-striped espresso flow from my portafilter. It looked like liquid gold for exactly eight seconds. Then, without warning, the stream turned thin, blond, and watery. I took a sip and nearly choked; it was as sour as…









