In a large jar or pitcher, add the coarsely ground coffee and cold water. Stir gently to ensure all the grounds are saturated.

Cover the jar with a lid or plastic wrap and let it steep at room temperature for about 12 hours.

After steeping, use a fine mesh strainer or coffee filter to strain the mixture into another container.

Transfer the strained concentrate to a clean jar or bottle, seal it tightly, and store it in the refrigerator for up to two weeks.

To serve, mix equal parts of the coffee concentrate with water, milk, or a milk alternative.

Add sugar, flavored syrups, or vanilla extract to sweeten the coffee to your liking.

For iced coffee, pour the mixture over a glass filled with ice.

Experiment with flavors by adding chocolate syrup or cinnamon.