CremaCraft

  Two shots can share beans, dose, and grind setting and still taste completely different. Often the difference is what happened to the grounds in the minute between grinding and locking in. That window is puck prep, and it decides whether water flows through the coffee bed evenly or finds a shortcut and rushes through one weak spot. This guide sets out the full routine in order — dose, WDT, settle, tamp — plus what not to do, how to spot channeling, and where prep ends and grind adjustment begins. Why Puck Prep Matters Espresso pushes hot water through a compacted bed of fine coffee at high pressure, and water under pressure always favours the path of least resistance. A clump, crack, thin patch, or loosely tamped area lets water concentrate there. That concentrated flow is channeling. A channeled shot is two faults in one cup. Coffee around the channel is over-extracted — too much water passed through it — giving bitter, harsh flavours. The rest of the bed is under-extracted b...

Sour and bitter are the two flavours that frustrate home baristas most, and they are opposites with opposite fixes — which is why guessing so often makes a shot worse. Each taste, though, points to a specific cause. This guide explains the extraction science in plain English, matches symptoms to causes and fixes in a diagnostic table, covers the non-grind culprits many people miss, and shows how to work one change at a time. For the full recipe framework behind these fixes, the guide to dialing in espresso is the companion piece to keep alongside this one. Extraction Science in Plain English Hot water does not pull every flavour out of coffee at once. It extracts compounds in a rough order: acids and salts first, sugars and sweetness next, and bitter, woody compounds last. A good shot balances all three stages, and the balance depends on how much of the coffee the water has extracted. Under-Extraction: Sour, Salty, and Thin When water passes through too quickly, or there is not en...