How to Make Cold Brew Coffee at Home
Cold brew isn't just iced coffee—it's a completely different extraction method that produces a smooth, naturally sweet concentrate with significantly lower acidity than traditional hot-brewed coffee. By steeping coarsely ground coffee in cold water for 12-24 hours, you extract the coffee's most desirable flavor compounds while leaving behind the harsh acids and bitter oils that heat pulls out. The result is a versatile concentrate that stays fresh for up to two weeks in the refrigerator, making it the ultimate make-ahead coffee solution for busy mornings, post-workout refreshment, or an afternoon pick-me-up that won't upset your stomach.
Taste Profile
What You'll Need
Equipment Checklist
Ingredients
100g coffee to 750ml water (creates concentrate to dilute)
Step-by-Step Brewing Instructions
Grind Your Coffee Coarsely
Grind 100g of fresh coffee beans to a coarse consistency—think raw sugar or coarse sea salt texture. This is crucial: too fine and you'll get muddy, over-extracted brew; too coarse and the extraction will be weak. High-quality beans like LAMOSE coffee will give you the cleanest, most flavorful concentrate. If you don't have a grinder, ask your coffee shop to grind them on their coarsest setting.
Combine Coffee and Water
Add your coarsely ground coffee to a large glass jar or pitcher. Pour 750ml of filtered cold water (4-10°C / 39-50°F) directly over the grounds. Use filtered water if possible—chlorine and minerals in tap water can interfere with flavor extraction. The water should be cold or room temperature, never warm.
Stir Thoroughly
Stir the mixture vigorously for 30 seconds to ensure all the coffee grounds are fully saturated. You'll notice some grounds floating on top—this is normal. Give it a good stir to break up any dry pockets. This initial agitation jumpstarts the extraction process and ensures even flavor development.
Cover and Steep
Cover the jar with a lid or plastic wrap and place it in the refrigerator. Let it steep for 12-18 hours. The magic happens in this window: 12 hours gives you a lighter, brighter concentrate; 18 hours produces a richer, fuller-bodied result. For most coffee types, 15 hours is the sweet spot. Avoid steeping longer than 24 hours, as you'll start extracting unpleasant bitter compounds.
First Strain
After steeping, place a fine-mesh strainer over a large bowl or pitcher. Pour the coffee mixture through the strainer to remove the bulk of the grounds. Don't press on the grounds—let gravity do the work. This prevents excessive sediment from entering your concentrate. You'll notice the liquid is dark and somewhat murky at this stage.
Second Strain for Clarity
Line your strainer with a coffee filter, cheesecloth, or a clean kitchen towel. Strain the coffee a second time into your storage container. This step removes fine sediment and gives you that crystal-clear concentrate. Be patient—this can take 10-15 minutes. The result should be completely transparent with no cloudiness or floating particles.
Store and Dilute
Transfer your concentrate to an airtight container and refrigerate. It stays fresh for up to 2 weeks. To serve, dilute the concentrate with equal parts water, milk, or ice—typically 1:1 ratio for standard strength, but adjust to your preference. Pour over ice in an insulated tumbler to keep it cold for hours. Start with 60ml concentrate plus 60ml liquid and adjust from there.
Pro Tip for Advanced Brewers
Experiment with a hybrid approach: steep at room temperature for the first 4 hours to accelerate extraction, then move to the refrigerator for the remaining 8-12 hours. This technique extracts more aromatics while maintaining cold brew's signature smoothness. Also, try using a 1:8 ratio (100g coffee to 800ml water) with a darker roast, or 1:7 (100g to 700ml) with lighter, fruitier beans. Single-origin coffees shine in cold brew—their unique flavor notes become incredibly pronounced without heat's interference.
Troubleshooting Your Cold Brew
Too Bitter?
Cause: Over-extracted from steeping too long or grinding too fine
Fix: Reduce steep time to 12 hours and use a coarser grind size
Too Sour?
Cause: Under-extracted from insufficient steep time or water too cold
Fix: Extend brew time to 18 hours or use room temperature water
Too Weak?
Cause: Coffee-to-water ratio too low or grind too coarse
Fix: Increase coffee to 120g per 750ml water and ensure proper grind size
Too Strong?
Cause: Concentrate not diluted enough or ratio too concentrated
Fix: Dilute with more water/milk or reduce coffee to 80g per 750ml next batch
Common Mistakes: Do vs Don't
Do This
- Use freshly roasted beans (within 2-4 weeks)
- Grind just before brewing for maximum flavor
- Use filtered or bottled water
- Stir thoroughly at the beginning
- Store concentrate in an airtight container
- Experiment with dilution ratios to find your preference
- Keep refrigerated at all times
Don't Do This
- Use pre-ground coffee that's been sitting for weeks
- Grind too fine (like espresso)
- Use hot or warm water
- Press or squeeze the grounds during straining
- Leave concentrate at room temperature
- Steep for more than 24 hours
- Skip the second filtration step
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