Method

1. Combine the coarse grounds and cold water in a large jar or brewer. Stir to ensure all grounds are wet.
2. Cover and steep at room temperature or refrigerated for 16–18 hours.
3. Strain through a fine mesh sieve, then again through a paper filter to remove fine sediment.
4. Dilute the concentrate to taste — typically 1:1 with water or milk — and serve over ice.
5. Keep the concentrate refrigerated for up to two weeks.