To the bowl of a food processor or Vitamix blender, add
Fresh Basil Leaves (4 cups)
Walnuts (1/2 cup)
Garlic (3 cloves)
Crushed Red Pepper Flakes (1/4 tsp)
Parmigiano-Reggiano (1/2 cup)
Pulse a few times to break down the basil.
In a steady stream add
Extra-Virgin Olive Oil (1/2 cup)
, pulsing until olive oil is blended into other ingredients and mixture forms a loose paste.
Freshly Ground Black Pepper (1/2 tsp)
Kosher Salt (1 tsp)