Shrimp Puttanesca

Ingredients

• tablespoons extra-virgin olive oil, divided
• small yellow onion, chopped
• garlic cloves, minced
• anchovy filets, finely chopped
• teaspoon crushed red chili flakes, divided
• grape or small cherry tomatoes
• oil cured olives, pitted, coarsely chopped
• dry white wine
• teaspoons capers, rinsed
• teaspoon sugar, optional
• pound medium shrimp, shelled and deveined
• teaspoon salt
• chopped fresh Italian parsley