Combine coffee grounds and water in a large jar, stir well, cover and let it rest at room temperature for 24 hours or for night.

To filter, pour through a fine-mesh strainer a couple of times. Line the strainer with a paper towel and filter again once or twice. I used coffee filters.

Store in the fridge.

Pour one third of the concentrate in a glass, add sugar to taste, stir, add more ice and pour milk up to the top.

Enjoy your iced coffee!