1. Skin the piece of poached salmon and break the flesh into large flakes. Set to one side.
2. Drop the tagliatelle into a pan of boiling, salted water and cook for 3 minutes. 3. Meanwhile, very finely shred the basil. Put into a large saucepan with the oil, lemon zest, lemon juice, garlic, salt and pepper.
4. Add the salmon to the pan with dressing ingredients and stir gently over a very low heat until only just warm.
5. Drain the pasta well and tip into the dressing ingredients. Toss together lightly, and serve immediately.