Shrimp and Linguine Fra Diavolo Recipe

Ingredients

• 1 pound linguine
• 6 tablespoons extra-virgin olive oil
• 1 cup small diced onion
• 3 tablespoons minced garlic
• 2 to 3 teaspoons crushed red pepper flakes
• 1 1/2 cups canned tomato sauce
• 2 tablespoons tomato paste
• 1 1/2 pounds shrimp, peeled and deveined with tails removed
• 1 teaspoon salt, plus more for pasta water
• 2 tablespoons chopped fresh parsley leaves
• 1/2 cup grated Parmesan, optional