Slow-Brew Iced Coffee That's Never Bitter
Cold water, coarse grounds, and a little patience. Steep it overnight and you'll have a smooth coffee concentrate ready to pour over ice all week long — no fancy gear, no burnt aftertaste.
Cold water does the work, so the coffee stays sweet
Hot water pulls the bright, sometimes harsh oils out of coffee fast. Cold water takes its time and leaves most of that bitterness behind, which is exactly why cold brew tastes so mellow and naturally sweet. You steep a big batch of concentrate once, keep it in the fridge, and dilute a glass whenever you want one. It's the most forgiving way to make iced coffee at home — and the hardest to mess up.
The recipe below makes a concentrate, not a ready-to-drink cup. That's on purpose: a concentrate keeps longer, travels better, and lets everyone mix their glass exactly how they like it.
Slow-Brew Iced Coffee
Smooth overnight cold-brew concentrate. Makes about 4 cups of concentrate — roughly 8 iced servings once diluted.
Ingredients
- 1 cup coarsely ground coffee
- 4 cups cold filtered water
- 4 cups ice, to serve
- Milk, cream or a plant-based alternative, to taste
- Simple syrup or your sweetener of choice, optional
Amounts scale with the servings buttons above. Coffee-to-water ratio stays a steady 1:4 for concentrate.
Method
- Combine. Add the coarse grounds to a large jar or pitcher, pour in the cold water, and stir until every ground is wet. Coarse grounds matter here — fine ones slip through the filter and turn the brew muddy.
- Steep. Cover and leave it for 12 to 18 hours. Room temperature is fine; the fridge is a touch smoother. Longer steeping makes a stronger, rounder concentrate.
- Strain. Pour through a fine-mesh sieve to catch the grounds, then again through a paper coffee filter for a clean, sediment-free concentrate. Don't press the grounds — let it drip.
- Store. Keep the concentrate in a sealed jar in the fridge for up to a week.
- Serve. Fill a glass with ice, then pour equal parts concentrate and cold water or milk (start 1:1 and adjust to taste). Sweeten if you like, stir, and drink.
Five small things that make a big difference
None of these are required — but each one nudges your iced coffee from good to café-good.
Grind coarse & fresh
A coarse, even grind keeps the brew clean and easy to strain. Grinding just before steeping keeps the flavor lively.
Freeze coffee ice cubes
Pour leftover concentrate into an ice tray. Coffee cubes chill your glass without watering it down.
Sweeten with simple syrup
Sugar won't dissolve in a cold drink. A quick simple syrup (equal sugar and warm water) blends in instantly.
Mind the steep time
12 hours is bright and easy-going; 18 hours is bold and rich. Taste at 12 and decide from there.
Dilute to taste
Concentrate is strong on purpose. Start at one-to-one, then add more water or milk until it's yours.
Keep it sealed
Stored airtight in the fridge, concentrate stays fresh for about a week. Give it a sniff and a taste before pouring.
Three ways to change it up
Vanilla oat latte
Swap the milk for oat milk and add a splash of vanilla simple syrup. Creamy, lightly sweet, dairy-free.
Iced mocha
Stir a teaspoon of cocoa or a little melted dark chocolate into the concentrate before pouring over ice.
Affogato-style float
Pour cold concentrate over a scoop of vanilla ice cream for a dessert-y treat in under a minute.
Frequently asked questions
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