Put the cashews in a baking sheet into the oven and bake for 10 minutes or until golden brown. You can also buy toasted cashews and skip this step, but I like it better when I bake them right before blending.
Add the cashews into a food processor and blend for about 5 minutes.
While blending, the cashews will stick to the sides. When this happens, stop the food processor and scrape them down with a spatula.
Add the oil and salt and blend for 5 more minutes or until you get the consistency you're looking for.
Use immediately or keep it in a sealed container in a dark, cool place. It will last for months.
Notes
Using a food processor is the best option, but you can also use a powerful blender.
Blending time will vary according to how powerful your food processor is.
Feel free to make this cashew butter with any type of oil.
You can even omit the oil if you have a good food processor.
Salt is optional but the butter will taste better if you use it.