Combine the basil, arugula, pine nuts, pistachios, and garlic into the blender (or food processor). Blend until ingredients are finely chopped.
Add the olive oil, salt, and pepper to the mixture and blend on low until smooth.
Add the parmesan cheese and blend on low until all ingredients are mixed well together. Blend only for 1 minute or less)
If the consistency is too thick for your liking, feel free to add 1-2 tbsp olive oil and blend.