Guides
Sour or Bitter? Reading What Your Espresso Is Telling You
Sour espresso usually means under-extraction; bitter usually means over-extraction. Here's how to taste the difference and what to change.
Guides
Your Water Is Most of Your Coffee
A brewed cup is about 98% water, and its minerals shape extraction. Here's how calcium, magnesium, and bicarbonate work, plus the SCA target numbers.
Guides
Why Coffee Puffs Up: The Bloom, Explained
What the bloom actually is, why fresh coffee releases CO2, and how a 30 to 45 second pause makes your pour-over taste better.