Extraction, simply
Sour or thin coffee usually means under-extraction, so grind finer or brew longer. Bitter or drying coffee usually means over-extraction, so grind coarser or brew shorter. Change one variable at a time. Research from UC Davis's Coffee Center and Jonathan Gagné's writing explains the physics behind these rules.
Tasting like a cupper
Professional tasters score coffee on fragrance and aroma, flavor, aftertaste, acidity, body, balance, sweetness, uniformity and clean cup, following the SCA cupping protocol. You can borrow the same habit at home: smell the dry grounds, then the wet crust, then taste the coffee hot, warm and cool. Flavor opens up as the cup cools, so don't judge it in the first sip.
Using the flavor wheel
The SCA Coffee Taster's Flavor Wheel, built on the World Coffee Research Sensory Lexicon, works from the inside out. Start in the center with broad families — fruity, sweet, nutty/cocoa, floral, spicy, roasted — then move outward to specifics like berry, citrus, caramel or jasmine. If a coffee tastes "fruity," ask what kind of fruit. Naming flavors gets easier the more deliberately you compare cups side by side.
Acidity, body and sweetness
Acidity is brightness, not sourness: think citrus, apple or wine-like sparkle, and it's prized in high-grown coffees. Body is the weight on your tongue, from tea-like to syrupy. Sweetness signals ripe fruit and a clean roast. When a brew tastes flat or harsh, adjust the extraction first, then revisit what you taste.
