Grilled Pesto Shrimp

Bahan-bahan (4 porsi)

• 2 lbs extra large (26/30) or jumbo shrimp, peeled (tails left on) and deveined, (thawed if frozen)
• 6 tablespoons extra-virgin olive oil
• 1 cup basil leaves
• 3 large cloves garlic, (roughly chopped)
• ¼ teaspoon red pepper flakes
• ½ teaspoon salt
• ¼ cup grated Parmigiano-Reggiano
• ¼ cup walnuts
• 1 lemon, (cut into wedges, for serving (optional))