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Gently rinse the basil only if necessary, then dry it completely. Remove any thick stems.
Place the garlic, pine nuts, and salt in a mortar. Crush them into a smooth paste.
Add the basil a handful at a time, using a gentle circular motion to crush the leaves against the sides of the mortar.
Mix in the finely grated Parmigiano Reggiano and Pecorino Romano until evenly incorporated.
Slowly pour in the Oro Di Bolsena while stirring until the pesto is creamy and spoonable.
Taste the pesto and adjust with a little more salt or Oro Di Bolsena if needed. Use immediately or cover the surface with a thin layer of oil before refrigerating.