
Cold brew coffee is coffee steeped in cool or room-temperature water for many hours rather than brewed hot.
Steeping for 12–24 hours in cold water extracts less acid than hot brewing, so it tastes rounder and darker than the same beans brewed hot. Next to citrus or tonic, that softer coffee clashes less than hot-brewed coffee does.
Chilled filter or French-press coffee
Use one for one. The drink tastes a little brighter and more bitter.
Mix 1 part espresso to about 5–6 parts cold water to come close to filter strength.
Iced coffee
Brewed hot and chilled, it has more total acid, so expect a tarter drink.
Cold brew concentrate
Dilute it first: 1:1 for Starbucks or 1:2 to 1:3 for a Toddy batch. Undiluted, it makes the drink far stronger in coffee.
Sealed in the fridge it keeps about a week; concentrate keeps longer than diluted cold brew. The smell fades before the taste, so a week-old batch still tastes of coffee but smells of little.