On the one hand, it seems crazy to give a recipe for something so simple as an iced coffee. But if the difference is between a mediocre drink and a perfect one? Then a recipe makes sense every time. To make the perfect iced coffee, you’ll mix together cold-brew concentrate with water and a liquid syrup—either agave or simple syrup (the liquid part is key to making sure it’s well mixed throughout the drink). Lastly, top off with half-and-half for (yes, it’s true,) the perfect iced coffee.