Roasted Green Beans with Lemon, Pine Nuts and Parmigiano

Bahan-bahan (4 porsi)

• 1¼ pounds fresh green beans, (rinsed well, ends trimmed)
• 1 small head garlic
• ¼ cup + 1 Tablespoon extra-virgin olive oil, (divided)
• 1½ tablespoons finely grated lemon zest ((from 1 to 2 medium lemons), divided)
• 1½ tablespoons freshly squeezed lemon juice
• 1 teaspoon kosher salt
• ½ teaspoons freshly ground black pepper
• ⅓ cup pine nuts
• ¼ cup coarsely grated Parmigiano Reggiano cheese
• 1 tablespoon coarsely chopped fresh flat-leaf parsley