Soak your cashews at room temperature for at least 6 hours, or soak in boiled water for 20 minutes. To do this, you can simply boil water in an electric kettle, then pour the water over a bowl of cashews, covering them with water completely. Then place a plate over the bowl to trap the heat and let it sit for at least 20 minutes. Finally, drain the water and the cashews are ready to use.