Begin by butterflying the prawns: run a sharp knife down the back of the prawn and gently open out slightly. Don’t worry, it doesn’t have to be perfect - you just want to give them more surface area.
Pat the prawns dry on some kitchen paper, then pop into a bowl. Season with salt and freshly ground black pepper. Add the smoked paprika paprika and a drizzle of olive oil. Toss gently to coat. Set aside.
Next, fry the chorizo in a medium-sized non-stick frying pan set over a medium heat - you don’t need to add any oil as it will start to release the most gorgeous red oil as it cooks. Continue to cook for about 8 minutes, stirring every now and then, until golden. Add the prawns and cook for a few more minutes, stirring occasionally, until the prawns turn pink. Scoop the prawns and chorizo out of the pan and tip into a clean bowl, leave the oil in the pan (it has so much flavour).
In a separate pan of boiling salted water, cook the pasta according to packet instructions, or until al dente. Drain well, reserving some of the pasta water.
Meanwhile, add the onion and pepper to the chorizo oil, season, then cook over a medium heat for about 5-8 minutes, stirring occasionally, or until lovely and soft. Add the garlic and cook for another 30 seconds or so, stirring, until fragrant. Add the tomato purée and cook for a further minute, stirring to coat.
Add a splash of pasta water, stir well, then let it simmer for 1 minute. Pour in the cream and bring to a simmer. Reduce the heat and leave to simmer for another minute. At this point you can blitz with a handheld blender (or carefully pour into a food processor, blitz then return to the pan) if you prefer a smooth sauce.
Return the prawns and chorizo back into the pan, add the drained pasta, ¾ of the grated Parmesan and a generous grind of black pepper. Toss it all together. Add the chopped parsley and toss again. Taste and adjust the seasoning.
Spoon into bowls, sprinkle with the remaining Parmesan and a few dried chilli flakes, if desired. Enjoy!