Grilled Prawns with Spicy Fresh Pepper Sauce

Name: Grilled Prawns with Spicy Fresh Pepper Sauce
Ingredients: 1 1/4 cups olive oil; 1 grilled yellow bell pepper, peeled, seeded and finely diced; 1 grilled poblano chile, peeled, seeded and finely diced; 1 grilled serrano chile, peeled, seeded and finely diced, optional; 1/4 teaspoon red pepper flakes; 2 cloves garlic, finely chopped; 1/4 teaspoon kosher salt; Freshly ground black pepper; Splash red wine vinegar, optional; 2 tablespoons finely chopped fresh cilantro leaves; 24 prawns, in the shell, preferably with heads; 1 tablespoon olive oil; 1 teaspoons kosher salt; 1 teaspoon freshly ground black pepper