What does steeping mean in coffee? Steep time and grind explained

How does steeping extract flavor?

Compounds dissolve out of the grounds into the water around them, and the water slowly fills up. Coffee ad Astra explains that extraction in an immersion slows as the water becomes more concentrated.

That is the main difference from pour-over. Coffee ad Astra says a percolation brew keeps replacing the water with cleaner water, which keeps extraction fast. A steep has no fresh water arriving, so it slows itself down.

Coffee ad Astra also found that a steeped brew's chemistry closely follows the bean's own makeup. A percolation brew over-represents the compounds that dissolve fastest.

How long should coffee steep?

It depends on the method and the water temperature. Hot steeps take minutes, and cold steeps take hours.

Perfect Daily Grind calls four minutes "a safe starting point" for French press. It suggests less time for darker roasts and more for lighter roasts.

How much coffee should you steep?

It depends on whether you are making a cup or a concentrate. Wikipedia gives French press proportions of about 30 g of coffee to 500 ml of water.

Stumptown's cold brew starting point is a concentrate: 12 ounces of coffee to 64 ounces of water. It dilutes the result 1:1 with water or milk before drinking. To scale any ratio to your cup size, use the brew calculator.

What happens if you steep too long?

The coffee can turn bitter. Wikipedia says French press coffee left sitting on its grounds may become astringent and bitter, though some drinkers like that.

Cold brew has more room. Stumptown says a few extra hours past its 16-hour target will not ruin a batch. It still warns against going past 20 to 24 hours, which can bring bitter, woody notes.

Why does water temperature change steep time?

Hotter water extracts faster. Honest Coffee Guide says that the hotter the water, the faster and more effective it is at extracting flavor.

That is why cold brew needs hours where a French press needs minutes. Wikipedia notes that cold brew grounds never touch heated water, which gives it a different chemical profile from hot brewing. Read more under cold brew.

What grind should you use for steeping?

Usually coarse. Wikipedia recommends a French press grind "about the consistency of cooking salt," and Stumptown says cold brew should be ground "similar to what you'd use for a French press."

Coarse grounds do two jobs in a steep. Stumptown says they strain more easily and resist over-extraction over a long brew. Perfect Daily Grind warns that fine grounds extract too fast and slip through a press's metal mesh as grit.

So a grinder that makes many fines at coarse settings shows up as grit in a pressed cup. Find a starting setting in cold brew grind settings, or use the grind converter to move a recipe between grinders.