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Boil the kettle and heat the oil in a large, deep frying pan. Add the garlic, chilli and fennel seeds, and sizzle for a few mins. Pour the boiling water into a large pan and cook the pasta following pack instructions.
Add the paprika, tomatoes, sugar and seasoning to the pan and simmer for 8-10 mins while the pasta cooks.
Drain the pasta 1 min before the end of the cooking time, reserving a cup of the water. Add the pasta to the sauce with the seafood. Simmer for 1-2 mins, adding a splash of the reserved pasta water if it looks too thick. Toss the pasta through the sauce as it cooks. Add the herbs and black pepper, then serve.