Iced coffee Hot brewed coffee poured over ice. Intact aromatics and origin character. Japanese iced coffee brew directly on ice to preserve aromatics. Cold brew Steep coarse ground coffee for 12-24 hours in room temperature water no heat. low acid smooth chocolatey cup of coffee. Cold brew concentrate has high caffeine content, but is usually diluted to serve. Iced coffee for single origin drinkers who want brightness. Cold brew for drinkers who want rich smooth uncomplicated cold coffee. Cold brew will last for two weeks in the fridge.