The following tutorial comes from High Low Food and Drink a wonderful NYC based food blog:
Making the coffee concentrate was really easy. We soaked 1 cup of ground coffee in 9 cups of cold water for at least 12 hours in the refrigerator. We used our Cafe Du Monde for the chicory flavor needed to make Vietnamese iced coffee or simply use your favorite gourmet coffee The grinds can be soaked in any container, like a French press, glass jar, or large pitcher.
After the overnight soak, I filtered the coffee concentrate with a fine sieve. Now the coffee concentrate is ready to be used in a variety of ways.
#1: Regular Iced Coffee (1 serving)
In a glass, mix together 1 cup coffee concentrate, 1/4 to 1/2 cup milk (depending on your preference), and fill the glass with ice. Even if you like your coffee black (as my hubby enjoys his coffee), the coffee concentrate is too rich to drink on its own.
#2: Vietnamese Iced Coffee or Ca phe sua da (1 serving)
#3: Thai Iced Coffee or Oliang (1 serving)
Thai Iced Coffee is similar to Vietnamese Iced Coffee, just a little less sweet and more fragrant from the cardamon. In a glass, mix together 1 cup of coffee concentrate (made with any strong coffee) with half-and-half and sugar to taste, 1/8 teaspoon of cardamon, and fill the glass with ice.
#4: Irish Iced Coffee (2 servings)
This makes a perfect after dinner drink. In a cocktail shaker, mix together 1 cup coffee concentrate, 1/2 cup milk, 2 oz liqueur (e.g. Baileys, Amaretto, Kahlua, or Irish whiskey), and ice. Shake and pour into 2 tumblers. Optional: Add an ice cube, sugar to taste, and a dollop of whipped cream on top.
How will you use your iced coffee concentrate?