In a pot, boil the spaghetti according to the packet directions in salted water until al dente. Drain.
In the meantime, heat the butter and olive oil in another pot. When that is hot, put in the garlic and fry for 3 minutes on medium heat.
Add the prawns and basil in the pot and fry for about 2 minutes before adding in the calamari.
Stir the contents for another two minutes and pour in the white wine. Let it cook off for a few more minutes before adding the tomatoes.
Throw in the brown sugar and lemon zest and juice.Simmer for a few minutes, and season with salt and pepper.
Turn off the heat and dish out the spaghetti in bowls before adding in the sauce and seafood (more for me, thanks!).
Serve with parsley sprigs and grated Parmesan on the side. Top up with optional mussels.