Carefully measure 4 ounces of whole coffee beans using a digital food scale.
Pour the coffee beans into a coffee grinder. Grind the beans into a coarse-like texture. If you grind the coffee beans too fine, it can result in over-steeping.
Add the ground beans to your French press or fine mesh bag.
Fill the French press with 4 cups of water. Place the lid on the French press and press down slightly to make room if needed. If you're not using a French press, place the nylon bag in a wide mouth vessel which can hold the beans and water.
Place your container in the fridge. Steep for 18-24 hours.
Gently press the beans as you would press a regular pot of French pressed coffee. If you're not using a French press, remove the nylon bag of ground beans, allowing the bag drip back into the container. Discard.
Enjoy your cold brew coffee concentrate!