Cold brew isn't iced coffee. Iced coffee is brewed hot and chilled, which locks in the acidity and the bitterness. Cold brew never sees heat at all, and that one change makes a cup that's noticeably sweeter, rounder, and up to 60% lower in acid. If hot coffee bothers your stomach, this is your method.
Why cold water changes everything
Hot water extracts fast and pulls out acids and bitter compounds along with the good stuff. Cold water extracts slowly and selectively, leaving most of those harsh compounds behind and drawing out the sugars, chocolate, and nut notes instead. The trade is time: what hot water does in four minutes, cold water needs twelve to eighteen hours to do.
What you need
- Coarsely ground coffee, about the texture of raw sugar or sea salt
- Cold filtered water
- A jar, pitcher, or French press
- A fine mesh strainer plus a paper filter or cheesecloth
- Patience, roughly overnight
Choosing your coffee
Cold brew rewards medium and dark roasts, which bring the chocolate and caramel body this method is known for. Sumatra, French Roast, and Italian Roast make a deep, syrupy concentrate. Colombia and Brazil Santos give you a smoother, nuttier, more balanced cup. If you want to skip the grinding entirely, our Cold Brew Coffee is already ground for exactly this.
The ratio
For a concentrate you'll dilute later, use 1 part coffee to 4 parts water by weight, roughly 1 cup of grounds to 4 cups of water. For ready-to-drink cold brew you can pour straight over ice, go 1 to 8. Start with the concentrate, it's more flexible and it keeps better.
The method, step by step
- Grind coarse. This matters more here than anywhere. Fine grounds over 16 hours turn muddy and bitter, and they clog your filter.
- Combine. Add grounds to your jar, pour the cold water over them, and stir until every ground is wet. Dry pockets floating on top brew nothing.
- Steep. Cover and leave it 12 to 18 hours. Room temperature extracts faster and tastes bolder; the fridge is slower and cleaner. Twelve hours at room temperature or eighteen in the fridge are both excellent starting points.
- Strain twice. First through a fine mesh strainer to catch the grounds, then through a paper filter or cheesecloth to catch the fines. The second pass is what makes it taste clean instead of silty.
- Store. Concentrate keeps up to two weeks in a sealed container in the fridge. Diluted cold brew is best within a week.
How to serve it
Dilute concentrate 1 to 1 with water or milk over ice, then adjust to taste. A few favorites:
- Classic: concentrate, cold water, plenty of ice.
- Cold brew latte: concentrate with whole or oat milk, 1 to 1.
- Sweet cream: a splash of heavy cream and vanilla syrup poured over the top so it cascades.
- Coffee ice cubes: freeze some concentrate so your glass never waters down.
Troubleshooting
- Weak or watery? Use more coffee or steep longer. Don't grind finer.
- Bitter or muddy? Your grind was too fine or you steeped past 20 hours.
- Silty texture? Skip the second filter pass and you'll taste it. Strain again through paper.
- Sour? Under-extracted. Give it a few more hours next batch.
Pro moves
Make a double batch on Sunday and you've got coffee all week with zero morning effort. Label the jar with the date. And if you like the body of cold brew but want it hot, heat the concentrate with hot water rather than reheating brewed cold brew, it keeps the smoothness intact.