Most cold brew coffee recipes use a 7:1 water to coffee ratio. In other
words, for every liter of water you’re going to use about 140 grams of coffee.
Really coarse grind, add water and stir.
With this corse of a grind, the coffee should be allowed to steep for 12
hours at room temperature. If you want to slow down the process, (i.e. not wake
up at 4 am to decant cold brew) you can steep it in the refrigerator to add a
few hours. Put the lid back on the French press, but be careful not to plunge
it.