Place the cheesecloth over the lip of the mason jar or server, and gently push the middle of the cheesecloth through the jar's mouth. Create a sort of "basket" that goes down into the jar about 5 inches deep (meaning the cheesecloth extends into the jar). Attach the rubber band over the lip of your server and over the cheesecloth to keep the cheesecloth firmly in place as well as the basket. See photos in post for further demonstration.
Next, add your 170 grams of coffee grounds to the basket. Level out the ground by gently tapping the side of your jar as you add more grounds, so it doesn't overflow.
Slowly, pour the water directly over the coffee grounds (that are sitting in the basket) in about 1 cup increments until you've added all of the water. You will notice the water seeping into your jar by now, and should look like the color of tea. Cover the top of the cheesecloth basket either with a lid, beeswax wrap, or plastic wrap to protect it from absorbing any smells from the surrounding area.
Let it steep on the countertop for 12 to 15 hours or in the refrigerator for 15 to 18 hours. After it has finished steeping, serve. Make sure to use 1 part cold brew concentrate to 1 part milk or water to balance out the strength of the brew.
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Serving Size 1/2 cup