Combine the coarsely ground coffee beans and filtered water in a large pitcher or jar.
Stir gently to ensure all coffee grounds are saturated.
Cover the pitcher and let it steep at room temperature for 12-24 hours. The longer it steeps, the stronger the flavor.
After steeping, strain the coffee concentrate through a fine-mesh sieve lined with cheesecloth or a coffee filter to remove all grounds. You may need to strain it twice for a clear brew.
Dilute the cold brew concentrate with water or milk to your desired strength. Typically a 1:1 ratio of concentrate to liquid is a good starting point.
Serve over ice. Add sweetener or milk as desired.
Notes
Store the cold brew concentrate in an airtight container in the refrigerator for up to two weeks. Enjoy your homemade cold brew!