Place the cashews in a large bowl and cover with fresh water. Soak overnight, or for at least 8 hours.
The next day, drain the cashews and rince them well under cold water.
Combine the cashews and all the other ingredients in the bowl of a blender and blend for about 4-5 minutes until the sauce is very smooth and creamy. You can adjust the consistency by using more or less water.
Taste and adjust the salt and pepper to taste. The sauce will keep for about 5 days in the refrigerator.
Notes
Feel free to add one teaspoon of maple syrup if you want to add a little bit of sweetness.