In a large bowl, combine prawns, red pepper flakes, smoked paprika and salt. Pour in 1 tbsp. oil and toss to coat.
In a large skillet over medium-high heat, add the remaining 2 tbsp. oil and when it starts shimmering, add shrimp mixture in a single layer. Cook for 1:30 minutes per side (*see footnote).
Using a slotted spoon, transfer the shrimp to a bowl and set aside.
In the same skillet, reduce heat to medium and add onions; sprinkle on salt. Sauté for 2 minutes or until translucent.
Add roasted red peppers and garlic; sauté for 1 minute. Add tomato paste and stir to coat.
Add diced tomatoes and pour in white wine; season with black pepper and Italian seasoning. Stir well, reduce the heat to medium-low and simmer gently for 15 minutes.
Meanwhile, cook the pasta according to the package directions.
Return the shrimp to the skillet including any accumulated juices and add lemon zest. Cook until warmed through, about 2 minutes.
Add cooked linguine and chopped parsley; stir until blended. Serve in warm bowls and sprinkle on some Parmesan cheese.
Notes
Footnote: I sauté the prawns/shrimp for 1:30 minutes and then only 1 minute after I flip them.