In a clean jar or pitcher, add 1 cup coarsely ground coffee. Pour 4 cups cold filtered water over the grounds, ensuring all grounds are saturated. Stir gently for 10–15 seconds to make sure there are no dry pockets.

2. Steep

Cover the jar or pitcher and let the coffee steep at room temperature or in the refrigerator for 12–18 hours. Longer steeping (up to 18 hours) yields a stronger concentrate; around 12 hours is milder.

3. Strain

After steeping, strain the mixture through a fine mesh sieve lined with a coffee filter, cheesecloth, or a nut-milk bag into a clean container. If needed, strain a second time to remove fine sediment. The liquid collected is the cold brew concentrate (~3 cups).

4. Store

Cover and refrigerate the concentrate for up to 7–10 days. Use chilled when preparing iced coffee.

To Serve

5. Prepare glass

Fill a tall glass with about 1 cup of ice cubes (or adjust to preference).

6. Dilute concentrate

Pour 3/4 to 1 cup cold brew concentrate over the ice. For a ready-to-drink strength, dilute concentrate with cold water or milk to taste: typical ratios are 1:1 concentrate to water/milk (use 3/4 cup concentrate + 3/4 cup milk/water for one large glass) or 1:2 for a lighter cup. The recipe provides 3 cups concentrate total; use the ratio you prefer.

7. Add milk and sweetener

If desired, add up to 1 cup milk (or dairy-free alternative) divided across servings. Stir in 2 tablespoons simple syrup or other sweetener, and 1 teaspoon vanilla extract if using; adjust sweetener to taste. Stir well to combine so the sweetener dissolves.

8. Serve

Taste and adjust: add more milk or sweetener if needed. Serve immediately over ice. Leftover concentrate should be refrigerated.

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