I want to teach you something I wish someone had taught me at 19. How to actually taste coffee, instead of just drinking it.

This is the single most useful skill in the coffee world. It costs nothing. You can practise it tomorrow morning with a cup you already make. And once you have it, every cup of coffee you ever drink will tell you more about itself, which means you will buy better coffee, brew better coffee, and stop putting up with worse coffee.

Here is the home protocol. It takes about ten minutes. Do it three days in a row and your palate will have changed.

Set up

You need:

A cup of black coffee, freshly brewed. Any method.
A glass of room-temperature water on the side.
No sugar. No milk. Both numb the palate.
No food in the last ten minutes. Toothpaste destroys the cup. Wait an hour after brushing.
A pen and a small piece of paper.

That is it. No special equipment. The cup is the laboratory.

Step 1: Smell before you sip

Bring the cup close to your nose and inhale slowly through both nostrils. Do not stick your nose into the cup. Hover about two inches above the surface.

Write down the first word that comes to mind. Not the second. Not the third. The first one. It can be a noun (chocolate, blackcurrant, hay) or a feeling (warm, dry, bright). Do not edit it.

Now smell again, more deliberately. What do you smell on the top of the cup that is different from what you smelled the first time? Write that down too.

The first smell is dominated by the most volatile aromatics. The second smell catches the heavier, deeper notes that take a moment to rise. Both are real. Both are yours.

Step 2: Take a small slurp

Slurp. Loudly. Pull air across the coffee as it enters your mouth.

I know this sounds undignified. It is. It is also exactly what every coffee professional in the world does, in every cupping room, every working day. The reason: the slurp aerosolises the coffee across the back of your tongue and the roof of your mouth, where most of your sensitive taste receptors live. A sip is for politeness. A slurp is for tasting.

Hold the coffee in your mouth for two or three seconds. Move it around. Then swallow.

Step 3: Read the four dimensions

Every cup of coffee tells you about itself in four dimensions. Learn them in order. Once you can find each one consistently, you have crossed from drinking to tasting.

1. Acidity. Where on your tongue do you feel a tingle, a brightness, a sharpness? Front of the tongue is usually citric (lemon, grapefruit). Sides of the tongue near the back are usually malic (apple, stone fruit). A clean, bright acidity is a good thing in coffee. It is the difference between a great Kenyan and a dull instant. Most people who say they "do not like sour coffee" are reacting to bad coffee. Good acidity is the structure that carries the whole cup.

2. Sweetness. Coffee, properly roasted, is sweet. Not sugary. Sweet like ripe fruit, or molasses, or honey, or brown butter. Where do you taste it? Often in the middle of the tongue, after the acidity. If you cannot find sweetness in a cup, the coffee is either over-roasted (bitter has buried it), under-developed (the sugars never formed), or stale (the sugars have oxidised away). All three are common in commodity coffee. None are necessary.

3. Body. Hold the coffee in your mouth and pay attention not to the flavour, but to the physical texture. Is it thin like water? Light like tea? Round like cream? Heavy like syrup? Body is a tactile sensation. It is one of the most important and least discussed parts of the cup. A natural Ethiopian and a washed Kenyan can have completely different bodies, and both can be excellent.

4. Finish. After you swallow, count to ten. What is still in your mouth at ten? A clean coffee has a finish that is pleasant and tapers off. A great coffee has a finish that develops, where the last note at second ten is different from and complementary to the first note at second one. A bad coffee has a finish that lingers like ash, or disappears immediately, leaving the mouth feeling empty.

Write a single word for each dimension. Do this for every cup, for a week. Your vocabulary will grow on its own.

Step 4: Let it cool

The single most underrated trick in coffee tasting. Stop drinking the coffee while it is too hot.

Hot coffee suppresses your palate. Most of the real flavour in a cup is hidden until the coffee has cooled to about body temperature. Wait. Try it again at four minutes off the brew. Try it again at ten minutes. A great coffee gets better as it cools. A bad coffee gets worse. The slope of that curve will tell you most of what you need to know about whether the bag is worth re-buying.

Step 5: Compare

The single fastest way to train a palate is to taste two coffees side by side. Same brewing method, same dose, same water. One cup of one coffee, one cup of another. Smell both. Slurp both. Compare.

The differences will be loud. You will catch acidity in one that you could not see when tasting it alone. You will catch body in one that you missed before. Tasting comparatively is a shortcut to a year of solo cupping.

Buy two small bags from two different roasters. Or buy a Kenyan and an Ethiopian. Or buy a washed and a natural from the same farm. Brew them side by side. You will learn more in ten minutes than from any course.

The vocabulary is just labels

You will read coffee tasting notes that say things like "white peach, honeysuckle, brown sugar, lingering finish of cocoa nibs." Do not be intimidated by them. The note writers are not magicians. They are just people who have done the slurp-and-think exercise above, a thousand times. Their vocabulary grew. So will yours.

If a coffee tastes to you like blackcurrant, write blackcurrant. If it tastes like grandma's plum jam, write grandma's plum jam. The vocabulary is yours. The point of the exercise is not to match someone else's tasting notes. The point is to develop your own attention.

Why this matters

Once you can taste, you stop tolerating coffee that does not taste of anything. You start to recognise stale beans, over-roasted blends, dirty equipment. You start to ask roasters and cafes the questions that actually matter. You start to pay for the difference, because you can feel the difference.

That is how a coffee market improves. Not from the supply side. From the demand side. From drinkers who can taste.

So tomorrow, when you make your cup, smell it first. Slurp. Hold. Cool. Read it in four dimensions. Write one word per dimension. Do this for a week.

Then write to me and tell me what you tasted. I read every email.

Martin

How to taste coffee like a professional