Add cashew nuts to mixer bowl with 1000 g water. Cook for 20 min/100 degrees/reverse/speed 1/MC on.
Drain cashew nuts well, add back to mixer bowl with remaining ingredients. Blend for 30 sec/speed 9/mc on. Scrape bowl down and repeat until a very smooth paste is achieved - this may take a few minutes. Put it in an airtight container for 1-2 hours before using.
Store in an airtight container for up to 2 weeks in the fridge.