Pull the leaves off the basil and discard the stems. Rinse the leaves and measure. You’ll need 3 cups, lightly packed, for this recipe. If you have more or less, adjust the other ingredients to taste.
Put the oil in your blender jar first, then all other ingredients.
Blend until smooth.
Add salt if needed.
Notes
You may use pine nuts in place of walnuts for a traditional pesto sauce