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1
Toast pine nuts in a dry pan over medium heat for 2 minutes until fragrant; cool completely.
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2
Pound garlic and sea salt together in a marble mortar with pestle until a fine paste forms.
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3
Add basil in small handfuls, gently bruising and folding against the mortar wall to avoid oxidation.
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4
Fold in cooled pine nuts, crushing slightly to release oils.
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5
Add Parmigiano Reggiano and Pecorino Romano in three additions, folding gently between each.
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6
Drizzle cold olive oil slowly while folding with circular motions until emulsified into a thick, loose paste.
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7
Season with Tellicherry black pepper and taste for salt balance.
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8
Transfer to a glass jar and store covered with a thin layer of olive oil.