Add the cashews, garlic, basil and Parmesan to a food processor jar.
Add seasonings and lots of freshly squeezed lemon juice.
Blitz until you get a coarse mixture.
Add olive oil and give it a quick blitz again.
Notes
To add an extra depth of flavor to the cashew basil pesto, lightly pan-roast the cashews over medium heat until they turn slightly golden brown, and then use them for the recipe.
If you prefer a smoother consistency, you can use a blender instead of a food processor. I used my blender to make my mint coriander Chutney and it has that perfect smooth texture.
Add more or less olive oil depending on how thick you want the pesto to be.
Want the pesto to have that vibrant green color? Consider taking a couple of extra minutes to blanch the basil leaves before you use them for the recipe.
Pour the olive oil into the pesto in a thin stream as you're blending it. This will help it emulsify.