Cold brew at home: 1:8, twelve hours and zero bitterness
The same coffee, two sacred flavors. Cold water and time take out the sweetness and leave the acidity and bitterness in the grain — here's the exact recipe.
We poured the same coffee into the espresso machine and into a jar of cold water, and after twelve hours we got two different drinks that have almost nothing to do with each other. Espresso under pressure, at 92 degrees, extracted acids and bitter phenols in 25 seconds. The cold water from the refrigerator drained those same grains slowly, all night, and deliberately left most of what the espresso grabs by force.
That's the whole secret of cold brew:low temperature slows down the extraction and makes it selective. Acids and bitter alkaloids dissolve quickly at high temperature, and sweet and chocolate notes do not need heat — only time. That's why the cold-pressed concentrate turns out to be soft, rounded and a third less acidic than the hot version of the same coffee.
The ratio is 1:8 and why so much?
We are makingconcentrate, not a finished drink. The relationship that the editorial office maintains as a basis is1:8 by mass— 800 grams (milliliters) of cold water are used for 100 grams of coarsely ground coffee. This gives a strong concentrate which is then diluted with water, milk or ice in a ratio of approximately 1:1 to 1:2, according to taste.
The mill is more important than you think. For cold brew you needcoarse grinding, like a French press or larger — something between sea salt and raw sugar. Finely ground grain in cold water gives a muddy, bitter sediment and is difficult to strain. If you're making espresso at home, this is a completely different end of the grinder scale; we wrote about that in the text aboutespresso without bitterness.
That's the whole secret of cold brew: low temperature slows down the extraction and makes it selective .
The process is literally patience. Pour ground coffee into a jar, pour cold water, stir until all the beans are wet, cover and leave inin the refrigerator for 12 to 16 hours. We aim for 12 hours at about 4 degrees — past 18 hours the bitterness and woody tone starts to increase. After that, strain through thick cheesecloth, a paper filter or a fine strainer. The concentrate can be kept in the refrigerator until7 dayswithout loss.
Which grain to take
Cold brew is less forgiving than people say — bad coffee stays bad, just cold. But the method rewards certain profiles.Darker roasted grainsthey give chocolate, walnut and caramel, and go best with a classic milky cold brew. If you like fruitiness, go for a lighter, naturally processed coffee — you'll get strawberry and tropical fruits that are often masked by hot brewing. We explained in the text about how grain processing changes the saltprana, natural and honey treatments, and fresh grain for this you will find inBelgrade brewerywhich grind to order.
One warning from experience: don't put hot water "to speed it up". Hot-cold hybrid extraction (known as Japanese iced) is legit, but produces a sourer, fresher pizza — it's a different recipe, not a shortcut to cold brew. If you started cold, stay cold.
Questions & answers
short and to the point- What is the ratio of coffee to water for cold brew?
- For concentrate, use 1:8 by mass — 100 g of coarsely ground coffee to 800 ml of cold water. Dilute the finished concentrate with water or milk 1:1 to 1:2 before drinking.
- How long does cold brew last in the refrigerator?
- The extraction takes 12 to 16 hours at about 4°C; we aim for 12 hours. The finished, strained concentrate can be kept in the refrigerator for up to 7 days.
- Why is cold brew less acidic than espresso?
- Low temperature slows down and makes the extraction selective — acids and bitter phenols are less soluble in cold water, so sweet and chocolate tones remain. The result is up to a third less sour drink.
