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Heat the oil in a large pan, add the garlic and sizzle for a few mins, then add the courgettes and cook for a few mins more until starting to soften. Cook the pasta following pack instructions.
Add the tomatoes, sugar and seasoning to the pan, stir and simmer, uncovered, for about 10 mins while the pasta cooks.
Add the prawns to the sauce and bubble until they just turn pink. Drain the pasta and add to the sauce with the crème fraîche. Simmer for another 1-2 mins, then add the basil and serve.