If you love coffee that’s smooth, rich, and low-acid, this classic cold brew coffee recipe is your new go-to. Imagine sipping a velvety, naturally sweet coffee concentrate that you can enjoy all week without bitterness or quick fading flavors. The best part? You can make it without fancy machines — just a jar, water, and good-quality coffee. Pro tip: Use a medium-coarse grind and steep for 16–20 hours to hit the perfect balance between boldness and smoothness.
Why This Recipe Works
Cold brew isn’t just “coffee in cold water.” Its magic comes from slow extraction. Unlike hot brewing, which quickly pulls bitter compounds, cold brewing extracts flavors gently, leaving a smooth, naturally sweet cup.
- Coffee grind matters: Medium-coarse grind prevents over-extraction, which can lead to bitterness. Fine grind makes filtering harder and produces sludge.
- Water ratio science: A 1:4 coffee-to-water ratio (for concentrate) ensures enough soluble compounds are extracted for rich flavor without overpowering your palate.
- Time & temperature: Steeping 16–20 hours in the fridge slows extraction, yielding low acidity and balanced flavor. Too short, and the coffee tastes weak; too long, and it can become overly bitter.
Did you know? Using filtered water highlights coffee’s natural sweetness and aroma, while warmer water can unintentionally accelerate extraction and increase acidity.
Ingredients with Weights and Purpose
| Ingredient | Weight / Volume | Purpose |
|---|---|---|
| Coarsely ground coffee | 100g (1 cup) | Base flavor; medium-coarse grind ensures smooth extraction |
| Cold filtered water | 400g (400ml / 1 2/3 cup) | Solvent for coffee compounds |
| Optional: milk/cream | 50–100ml (1/4–1/2 cup) | Balances bitterness; adds creaminess |
| Optional: sweetener | 10–20g (2–4 tsp) | Sweetens naturally low-acid coffee |
Pro tip: Use freshly roasted beans for maximum aroma. Avoid pre-ground coffee labeled “instant” or “espresso” — they extract too quickly.
Equipment
Required:
- 1-liter glass jar or pitcher
- Scale (for accurate coffee-to-water ratio)
- Spoon or stirrer
- Fine-mesh sieve or coffee filter
Nice-to-have:
- Cheesecloth or nut-milk bag (for cleaner filtration)
- Airtight storage bottle
Step-by-Step Instructions
Step 1: Measure and Grind
- Measure 100g coffee beans. Grind to a medium-coarse texture (like sea salt).
- Visual cue: Grinds should hold shape, not powdery; uniform pieces for even extraction.
Step 2: Combine Coffee and Water
- Add 400g cold filtered water to your jar. Stir gently to ensure all grounds are wet.
- Time: 1–2 minutes stirring.
- Visual cue: All coffee appears hydrated; no dry clumps floating on top.
Step 3: Steep
- Cover jar and place in the fridge.
- Steep 16–20 hours.
- Pro tip: 18 hours is a sweet spot for balanced strength without bitterness.
- Visual cue: Dark amber liquid forms; grounds settle at the bottom.
Step 4: Filter
- Use a fine-mesh sieve or nut-milk bag to strain coffee into a clean container.
- Optional: Filter a second time for ultra-smooth texture.
- Visual cue: Liquid is clear; no floating grounds or sediment.
Step 5: Serve
- Dilute concentrate with equal parts water, milk, or plant-based milk. Add sweetener if desired.
- Serve over ice for the perfect refreshing drink.
Troubleshooting: Common Failures and Fixes
| Problem | Likely Cause | Fix Next Time |
|---|---|---|
| Bitter coffee | Over-extracted, steeped >20h | Reduce steep time; use coarser grind |
| Weak flavor | Under-extracted, steeped <16h | Increase steep time; use slightly finer grind |
| Cloudy coffee | Insufficient filtration | Double filter; use cheesecloth |
| Sludge in cup | Fine grind or stirred before serving | Let settle; decant slowly |
| Sour taste | Old or stale beans | Use freshly roasted beans |
Substitutions and Variations
Dietary swaps:
- Dairy-free: Use oat, almond, or soy milk
- Sweetener: Honey, maple syrup, or coconut sugar
Flavor swaps:
- Citrus twist: Add a few strips of orange zest during steeping
- Spice infusion: Add a cinnamon stick or cardamom pod
Scaling:
| Batch | Coffee | Water | Notes |
|---|---|---|---|
| 6-cup | 100g | 400ml | Standard concentrate |
| 12-cup | 200g | 800ml | Double batch; same steep time |
| 24-cup | 400g | 1.6L | Use larger jar; may need extra filtration |
Storage, Make-Ahead, and Freezing
- Fridge: 10–14 days in airtight bottle; dilute before serving.
- Freezer: Not recommended — coffee may separate and taste flat after thawing.
- Pro tip: Make a big batch on Sunday; enjoy all week without brewing daily.
Serving Suggestions and Pairings
- Classic: Over ice with 1:1 milk or oat milk
- Dessert pairing: Chocolate chip cookies, almond croissants, or cheesecake
- Flavor twist: Vanilla syrup, caramel drizzle, or coconut cream foam
FAQs
- Can I use hot water instead of cold?
You can, but it becomes hot brew coffee — higher acidity, faster extraction. - Can I double the recipe?
Yes, scale both coffee and water proportionally; steep time remains the same. - How to prevent bitterness?
Use medium-coarse grind and avoid steeping >20h. Filter thoroughly. - Can I make it in an air fryer or OTG?
No heat is needed; these devices don’t apply for cold brew. - Best beans for cold brew?
Medium or dark roast, freshly roasted, with chocolate or nutty notes.
Notes from My Kitchen
- Batch 1: 16-hour steep; coffee was weak. Adjusted grind coarser next batch.
- Batch 2: 20-hour steep; slightly bitter. Reduced steep to 18h.
- Final method: 100g coffee + 400g water, 18h steep. Smooth, sweet, low-acid, and ready for the week.
Nutrition and Disclaimer
- Approximate per 250ml serving (diluted 1:1): 5 kcal, 0g fat, 0g sugar (without added milk/sweetener)
- Note: Values are estimates; adjust based on milk type, sweetener, and portion size. Always store cold brew in a clean, airtight container.
Conclusion
This classic cold brew recipe gives you smooth, naturally sweet coffee concentrate every time with minimal effort. The key is grind size, steep time, and proper filtration — master these, and you’ll have a weekly coffee ritual that tastes far better than store-bought. Experiment with milk, sweeteners, and infusions, but remember: simple is often best. With these precise measurements, first-hand tips, and troubleshooting guide, your cold brew will be café-quality from the comfort of your kitchen.
