I spent two weeks last summer drinking what I thought was “cold brew” until a friend who runs a specialty coffee shop in Portland took one sip and said, “This is just cold coffee.” She was right. I’d been steeping for 4 hours with a 1:15 ratio, and what I got was this thin, sour thing that tasted like someone left regular coffee in the fridge.
The fix turned out to be stupidly simple: 1:7 ratio (coffee to water by weight) and 16 hours at room temperature. Not 12, not “overnight”—16. I tested this across four different bean origins, and anything under 14 hours left noticeable acidity. Past 18, you start getting this flat, over-extracted taste that no amount of dilution fixes.
Why 1:7 Works When 1:15 Doesn’t
Most cold brew recipes online suggest 1:15 or even 1:8 for “concentrate.” I tried 1:8 first.
