Cold-brew coffee concentrate

Put ground coffee in a clean food-grade container with enough space for the grounds and measured brewing water; do not overfill a nominal one-gallon jar. Add brewing water and stir until all grounds are wet.

Cover and steep for about 10–12 hours in the refrigerator. A chilled extraction may taste milder than a room-temperature one.

Line a fine sieve with clean cheesecloth over the second container and strain. Discard grounds and keep the concentrate covered and refrigerated.

Dilute 1 part concentrate with 2–3 parts drinking water to taste. The source gives eight to ten servings; eight is retained as a portion label, not a measured final drink yield. Use promptly; no verified multi-week storage life is claimed.