Basil Walnut Pesto is an interesting variation of a very popular sauce recipe called Pesto that is prominently used in the Italian cuisine.
Add all the ingredients in the jar of a food processor and pulse to blend everything.
Keep in mind to not make a paste of the ingredients.
In between blending, keep scraping the sides of the blender using a spatula.
Add some more olive oil if required while blending.
It is best to use pesto freshly made but you can store it in an airtight container for up to 2 days.