1/2 cup plus 5 tablespoons cold-pressed olive oil, divided
Place pistachios in a food-processor. Add cilantro leaves, 1 tablespoon lemon juice, and next 3 ingredients to processor. Using on/off turns, process until coarse paste forms. With machine running, gradually add 1/2 cup olive oil. Season pesto with pepper. Transfer pesto mixture to a bowl and whisk in remaining 1/4 cup olive oil and remaining 1 tsp. lemon juice.