Grind the 85 grams of coffee beans if using whole beans to a coarse grind. Place all of the grounds in the filter basket of your brewing vessel.
Place your filter basket properly into the brewing vessel so that you have a place to pour the water. Most cold brew coffee makers will have you place the basket inside of a glass/plastic carafe.
Slowly pour the water over the grounds about 1/2 cup at a time. It's best to allow the water to seep through the grounds completely and then you can add more water. Continue until you've poured all 380 grams over the grounds.
Let the brew steep on the countertop for 12 hours. If placing in the fridge for steeping, let it steep for 15 to 18 hours.
Once steeping is complete, remove the filter basket and discard the grounds (or repurpose them as compost!). Pour your cold brew into a glass, and add water and/or milk to dilute the cold brew concentrate if necessary. Finish it off with cold brew coffee ice cubes if desired!
Serving Size 1/2