Use coarsely ground coffee. This helps in extracting the flavors without making the coffee bitter.

In a large jar or container, add the coarsely ground coffee beans. Pour cold water over the coffee grounds, ensuring that they are fully submerged in the water. Use a ratio of around 1 part coffee to 4 parts water.

Give the mixture a gentle stir to ensure that all the coffee grounds are saturated with water.

Cover the jar or container and let it steep at room temperature for about 12 to 24 hours. The longer you steep, the stronger the coffee will be.

After the steeping period is over, strain the coffee concentrate using a fine-mesh sieve or a coffee filter. You can strain it multiple times to remove any fine particles for a smoother finish.

Cold brew concentrate is strong, so you may want to dilute it with water or milk according to your taste preferences.