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Preparation Time: 10 minutes
For the dressing:
Brown toast or crusty bread to serve (optional)
Make up the dressing in a small bowl by mixing the mayonnaise with the vinegar and water until you have a smooth pourable dressing. Add the wasabi and season to taste.
Divide the watercress between 4 plates and arrange the sliced avocado on top. Scatter over the prawns and drizzle over the dressing.