Grilled Zucchini and Prosciutto Skewers

Name: Grilled Zucchini and Prosciutto Skewers
Ingredients: Vegetable oil cooking spray; 2 packed cups fresh basil leaves; 1/3 cup toasted pine nuts, see Cook's Note; 2 tablespoons fresh lemon juice; 1 clove garlic, peeled and smashed; Zest of 1 large lemon; 1/2 teaspoon kosher salt, plus extra for seasoning; 1/4 teaspoon freshly ground black pepper, plus extra for seasoning; 1/3 cup extra-virgin olive oil; 1/3 cup (1 1/2 ounces) grated Parmesan; 3 medium zucchini, trimmed and each cut into ten 1/2-inch-thick rounds; Six 1/8-inch-thick slices prosciutto, quartered; 2 tablespoons extra-virgin olive oil; Special equipment: Six 6-to-8-inch bamboo skewers soaked in water for 30 minutes to prevent scorching, or 6 metal skewers.