Adapted from a recipe by Andrew Nadeau (aka my future Son-in-Law). Coarse grind fresh beans and use filtered water, for best results: Gently stir 1/3 cup of ground coffee beans into 18 ounces of water. Cover and let the refrigerator do the work. Wait 18-24 hours and voila! Cold brew concentrate – to be diluted, as desired. Strain into container through a fine sieve or cheesecloth. Results vary depending upon coffee beans. We added 4 ounces of water because it is a medium roast Columbian bean.