Pour the cashew mixture into a medium saucepan and bring to a simmer over medium heat, whisking continuously. Once the mixture comes to a simmer, lower the heat slightly and continue cooking and whisking until fairly thickened. This will take 10 to 15 minutes total.
This pourable sauce can easily be made thicker by simply using less water.
This recipe is from a cookbook that everyone will love, "Vegan Pizza" by Julie Hasson (Andrews McMeel Publishing, 2013). http://juliehasson.com/