First, boil the cashews in water for about 30 minutes. Drain them and add to the blender.Add all remaining ingredients and blend until completely smooth. Blend for about a minute, then test for creaminess. It should take about 3 minutes total to get it as smooth as possible.
Preset your ice cream maker to a hard gelato setting, and pour in ice cream mixture. Once churned, you can eat immediately as a soft serve, but for scoopable results, seal tightly and freeze for about 24 hours.