Getting Started
Cold Brew 101
Cold brew coffee is smooth, sweet, and low in acidity — perfect for hot weather or sensitive stomachs. This guide covers the simple immersion technique, ideal ratios, steeping times, and serving suggestions.
Cold Brew Fundamentals
Cold brew is coffee extracted with cold or room-temperature water over an extended period — typically 12-24 hours. The absence of heat produces a fundamentally different extraction profile: lower acidity, reduced bitterness, and a naturally sweet, smooth character. It's one of the simplest coffee preparations and requires no specialized equipment.
How Cold Brew Differs from Iced Coffee
Cold brew is brewed cold from start to finish. The low temperature extracts fewer acidic and bitter compounds, producing a mellow, sweet concentrate.
Iced coffee is hot-brewed coffee cooled over ice. It retains the acidity and brightness of hot brewing but in a chilled format. Japanese iced coffee (flash-brewed directly over ice) is a popular technique that preserves aromatics.
They're fundamentally different beverages with different flavor profiles. Neither is "better" — they serve different preferences.
The Basic Method
Equipment: - A large jar, pitcher, or French press (1L capacity is ideal) - Coarsely ground coffee - Cold or room-temperature water - A strainer and cheesecloth or paper filter - Scale (optional but recommended)
Concentrate recipe (strong, meant for dilution):
| Parameter | Value |
|---|---|
| Ratio | 1:5 (coffee to water by weight) |
| Dose | 200g coffee : 1000g water |
| Grind | Extra-coarse (cracked peppercorns) |
| Water temp | Cold or room temperature |
| Steep time | 16-24 hours |
| Storage | Refrigerated, up to 2 weeks |
Ready-to-drink recipe (drink as-is):
| Parameter | Value |
|---|---|
| Ratio | 1:12 to 1:15 |
| Dose | 75g coffee : 1000g water |
| Grind | Coarse (sea salt) |
| Steep time | 12-18 hours |
Step-by-Step
1. Grind. Grind beans extra-coarse for concentrate (even coarser than French press) or coarse for ready-to-drink. Finer grinds with long steep times produce harsh, over-extracted bitterness.
2. Combine. Add coffee and water to your container. Stir gently to ensure all grounds are saturated. No dry clumps should remain on the surface.
3. Steep. Cover and let sit at room temperature or in the refrigerator.
- Room temperature: Faster extraction, slightly fuller body. 12-16 hours.
- Refrigerator: Slower extraction, cleaner and mellower. 18-24 hours.
4. Filter. Strain through a fine mesh strainer to remove the bulk of the grounds. For a cleaner cup, do a second pass through a paper filter or cheesecloth-lined strainer.
5. Store. Transfer the finished cold brew to a sealed container in the refrigerator. Concentrate keeps for up to 2 weeks; ready-to-drink is best within 5-7 days.
Serving
Concentrate should be diluted before drinking: - Standard: 1 part concentrate to 1-2 parts water or milk - Iced: Pour over ice (the ice will dilute it further as it melts) - Hot: Add hot water for a quick, smooth hot coffee (not common but works)
Ready-to-drink can be served straight over ice. Add milk, cream, or sweetener to taste.
Choosing Beans
Cold brew's low acidity and sweet profile pairs well with:
- Medium to dark roasts — chocolate, caramel, and nutty notes are amplified
- Brazilian and Colombian coffees — their natural sweetness and body shine
- Blends — designed for balance and consistency
Light roast, high-acidity single origins are less ideal for cold brew — their bright, fruity character can taste flat or sour when cold-extracted.
Troubleshooting
| Issue | Cause | Fix |
|---|---|---|
| Bitter and harsh | Over-extracted | Grind coarser, reduce steep time, or reduce dose |
| Sour or sharp | Under-extracted | Grind slightly finer, increase steep time |
| Weak and watery | Too little coffee | Increase ratio (more coffee per water) |
| Cloudy and silty | Fine grounds | Use extra-coarse grind, double-filter through paper |
| Stale taste | Old concentrate | Use within 7-10 days |
Cold Brew Tips
- Buy in bulk. Since cold brew uses a lot of coffee and the long extraction is forgiving of bean freshness, this is a good place to use larger, more economical bags.
- Make it a routine. Start a batch every Sunday evening for the week ahead.
- Experiment with additions. Cinnamon sticks, vanilla beans, or cocoa nibs can be steeped with the coffee for flavored cold brew.
- Don't over-steep. Beyond 24 hours, cold brew starts extracting woody, astringent compounds even at low temperatures. Set a timer.
Nitro Cold Brew
If you've tried nitro cold brew at a cafe — cold brew infused with nitrogen gas, served from a tap like beer — you've experienced its signature creamy, cascading texture and foamy head. Home nitro systems are available ($100-200) using small nitrogen cartridges, but they're a luxury rather than a necessity. Regular cold brew over ice is excellent on its own.