In the bowl of a pestle and mortar add the garlic and kosher salt. Smash until a paste forms.

Begin adding the basil in small bunches, continuing to crush until incorporated with the garlic and all of the basil has been used.

Add the pine nuts or walnuts and crush to incorporate.

Slowly add in the olive oil a little bit at a time. Continue to work until emulsified and the sauce starts to thicken.

Add the grated parmesan cheese in batches until incorporated.

Add the garlic, salt, basil, pine nuts, parmesan cheese to the bowl of a blender and blend until a paste forms.

With the blender running, slowly drizzle in the olive oil until thick and emulsified.