Bring a saucepan of water to the boil. Add the prawns and simmer for 2 minutes, or until pink
and are cooked through. Drain and leave to cool. Pat the prawns dry with paper towels and slice in
half lengthways. Place in a large serving bowl.
Add the fennel, watercress and chives to the bowl and mix well
To make the dressing, whisk the oil, lemon juice, mustard and garlic together until combined.
Pour the dressing over the salad, season and toss gently. Arrange the salad on serving plates and