For the tomato sauce,
heat the olive oil in a pan, add the onion and
carrot and stir over a medium heat for 10 minutes,
or until the vegetables are lightly browned.
Add
the garlic, tomatoes, white wine and sugar. Bring to
the boil, reduce the heat and gently simmer for 30
minutes, stirring occasionally.
Scrub the mussels
with a stiff brush and pull out all the hairy
beards. Discard any broken mussels, or open ones
that do not close when tapped on the work surface.
Rinse well. . Peel the prawns and gently pull out
the dark vein.
Heat the wine together with the
stock and garlic in a large pan. Add the mussels. Cover the pan and shake it over a high heat for 4 to
5 minutes. After 3 minutes, start removing any
opened mussels and set them aside. After 5 minutes,
discard any unopened mussels and reserve the liquid.
Cook the spaghetti in a large pan of boiling
salted water until al dente. Drain and keep warm.
Melt the butter in a frying pan, add the calamari
rings, fish and prawns in batches and stir-fry for 2
minutes, or until just cooked through.
Remove from
the heat and add the reserved liquid, mussels,
calamari, fish, prawns and clams to the tomato sauce
and stir gently until heated through. Gently combine
the sauce with the pasta and serve at once.