Iced coffee

Why it so often tastes watery

CoffeeHQ explanation

Hot coffee poured over ice melts a good deal of it before the drink is cold. All of that meltwater ends up in the glass. If the coffee was brewed at normal drinking strength, it is now well below it.

There are two ways round this. One is to chill the coffee first, in the fridge, so that it melts little ice; this works but takes time, and coffee left to cool slowly loses aroma and can taste stale. The other is to plan for the melt, and it is the better method.

Brewing straight onto ice

Widely documented

1. Decide the total water as usual. Start from your normal recipe. For 18 g of coffee at a typical filter ratio, that is about 280 to 300 g of water.
2. Replace part of the water with ice. Put roughly a third to two fifths of that weight in the server as ice, and brew with the rest as hot water. For 300 g in total, that is about 110 g of ice and 190 g of hot water.
3. Grind a little finer. Less hot water is passing through the coffee, so it needs help to extract fully. A slightly finer grind compensates.
4. Brew onto the ice and swirl. Brew directly over the ice. It chills the coffee within seconds, and by the end most of it has melted and brought the drink to normal strength.
5. Serve over fresh ice. Pour into a glass of new ice. The coffee is already cold, so this ice melts slowly.

This is often called flash brewing or Japanese-style iced coffee. Any pour-over or batch brewer can be used.

Amounts for one glass

Typical range

A starting point for a pour-over. The right split between ice and hot water depends on how warm the room and equipment are.

Other drinks sold as iced coffee

Widely documented

Iced americano

Espresso over cold water and ice. Stronger in roast character and quicker to make if you have an espresso machine.

Iced latte

Espresso and cold milk over ice. The milk does the diluting, so melt matters less.

Sweetened and regional styles

In many countries iced coffee means a sweet, milky drink, sometimes with ice cream or condensed milk. The name alone does not tell you which you will get.

Fixing a disappointing glass

CoffeeHQ explanation

Weak and watery

Usually because: The melt was not allowed for.

Change first: Brew onto ice with less hot water, as above.

Weak coffee

Sour and sharp

Usually because: Too little taken from the coffee when brewing with a reduced amount of hot water.

Change first: Grind finer.

Sour coffee

More bitter than the same coffee hot

Usually because: Cold mutes sweetness and aroma, which leaves bitterness more exposed.

Change first: Use a lighter roast, or a little sugar syrup, which dissolves where granulated sugar will not.

What to do next

• Cold brew versus iced coffee — The two cold coffees compared on taste, caffeine and effort.
• Pour-over planner — Works out the pours once you have decided how much hot water to use.
• Iced latte — The milk-based alternative, where dilution behaves differently.
• Become a barista — A structured programme from dose and grind through milk, drinks and maintenance.