Cook the linguine in a large pan of salted boiling water according to the packet instructions. Before draining, scoop out a mugful of the pasta water.
Meanwhile, add the chorizo to a large frying pan over a medium-high heat. Cook for 2-3 minutes until it starts to crisp up and releases its oils.
Add the prawns and cook for 1-2 minutes, then add the garlic and chilli and cook for a further 30 seconds.
Pour in the white wine and let it bubble away for 1-2 minutes, until reduced by about half.
Add the drained linguine to the pan along with the butter, the juice of half of the lemon, parsley, and a good splash of the reserved pasta water.
Toss everything together over the heat until the butter melts and the pasta is coated in a glossy sauce. Add another splash of pasta water if it needs loosening.
Taste for seasoning, then dish it up and finish with some lemon zest.