In a large pot of salted water, boil the pasta by the packet instructions. Reserve one cup of pasta boiling water for later use. Once it is cooked, drain water.
Meawhile the pasta is cooking, you can prepare the prawn and chorizo.
Heat the pan into medium-heat, drizzle olive oil and saute the chorizo for 1-2 minutes. Remove from pan and set it aside.
Add prawns in the remaining oil. Once the prawns turn pink turn sides, stir in chopped garlic. Season the prawns with salt, pepper and smoked paprika. Stir it well.
Now place the chorizo and boiled pasta in the pan. Season with salt and pepper to taste.
Pour half cup of reserved pasta water in. Add more water if needed.
Toss well to combine everything evenly, until there is no water in the pan.
Turn off the heat, squeeze fresh lemon juice and sprinkle chopped parsley.
Transfer to serving plate and garnish with freshly grated parmesan and parsley if desired.