Cook the tagliatelle in lightly salted boiling water for 10 minutes.
Meanwhile, heat the oil over a gentle heat and cook the garlic for a few seconds without browning. Add the chilli and prawns and fry for 2 minutes until the prawns are heated through.
Drain the tagliatelle and add to the prawns, along with the cherry tomatoes, grated courgette and lemon juice, plus the zest, if using. Toss together and serve.
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