Turkey Involtini - Fresh-Pressed Olive Oil

Ingredients

• 1 small yellow onion, about 4 ounces
• 2 garlic cloves
• 1/4 cup pine nuts
• 6 tablespoons extra virgin olive oil, divided use
• 12 ounces fresh spinach, rinsed, patted dry, and coarsely chopped
• 1 teaspoon each coarse sea salt and freshly ground black pepper, divided use
• 1 whole boneless, skin-on turkey breast, butterflied and pounded to about 1/2-inch thickness
• 8 ounces sun-dried tomatoes, coarsely chopped
• 12 ounces fontina cheese, coarsely grated