why my coffee tastes bitter

You’ve dialed in your shot perfectly. You’re using freshly roasted, world-class beans. But your espresso still tastes… off. Bitter, muddy, or just stale. Before you blame your machine or your technique, there’s a silent culprit you’re probably ignoring: a dirty grinder. Think of your grinder not as a tool, but as a pantry. Old, rancid coffee…