Knowing how to make iced coffee from hot coffee is an art. If you're pouring hot coffee directly over ice, you're doing it wrong. Your coffee will be bitter and overly diluted, so you won't be able to enjoy the earthy, sweet balance of coffee aromas.
As a barista, my summers were consumed by iced coffee. I was trained to make Japanese iced coffee; American iced coffee; and I also learned how to make cold brew coffee. All of these methods cool at different rates, which is why they have different flavor profiles. The slower the process, the sweeter and more balanced your coffee will taste.
