Your Tongue Is Barely Involved: How You Actually Taste Coffee
Ever Had Coffee With a Blocked Nose?
Think back to the last time you had a cold. You made your usual coffee, took a sip... and it tasted like warm, bitter water. Same beans, same brew, same you. So what disappeared? Here's the surprise: your tongue was working perfectly fine. What you lost was your nose — and your nose does most of the tasting.
Your Tongue Only Knows Five Words
Your tongue is a fairly simple instrument. It can detect just five basic things: sweet, sour, salty, bitter, and umami. That's it. There is no taste bud for 'jasmine', no receptor for 'dark chocolate', no sensor for 'red berries'. When you sip an Ethiopian coffee and get that floral, tea-like character, your tongue is only reporting 'pleasantly sour, slightly sweet'. Everything else — the entire story of the cup — is coming from somewhere else.
Meet Retronasal Smelling
Here's the part most people never learn. You don't just smell through your nostrils. When coffee is in your mouth, warm aromatic vapours travel up the back of your throat into your nasal cavity. This is called retronasal olfaction, and it's how your brain builds flavour: it takes the five basic tastes from your tongue, layers hundreds of aromas on top, and fuses them into one experience. Scientists estimate that around 80% of flavour is actually smell. A blocked nose closes that back door — and the coffee goes flat.
Why Coffee Is Such a Show-Off
Coffee is one of the most aromatically complex things you'll ever consume — researchers have identified over 800 aroma compounds in roasted coffee. Wine, for comparison, has a few hundred. Those compounds are volatile, meaning they evaporate easily, which is exactly why a fresh cup fills the room. It's also why temperature matters: a scalding cup releases aromas too fast and numbs your palate, while a cup that's cooled slightly lets you catch far more.
The Trick: Slurp (Yes, Really)
This is why baristas slurp at cuppings. A quick, noisy sip sprays the coffee across your palate and pulls air in with it, pushing those vapours up the retronasal passage. You don't have to be loud about it in public — just take smaller sips, let the coffee sit for a second, and breathe out gently through your nose after swallowing. You'll be amazed what shows up.
How We Use This at Yugen
This is exactly why we brew our light-roasted Ethiopian on the V60 and Chemex — filter brewing produces a clean, clear cup where those delicate floral aromas can reach your nose without interference. And it's why our medium-roasted Colombian goes through the espresso machine: the deeper caramel and chocolate aromas stand up beautifully in milk drinks. All our beans are roasted here on the island by Blend Coffee Roasters, so those 800+ volatile compounds are still fresh and lively when they hit your cup.
Next time you're in, before your first sip, hover over the cup and take one slow breath. You've just done half the tasting already.
Your tongue tastes five things. Your nose tastes everything else.