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Start by making the dressing; whisk together all the ingredients in a small mixing bowl. Taste and adjust the seasoning as necessary, adding a little more lemon juice if required.
Toast the walnuts in a dry frying pan over a medium heat for 2–3 minutes until golden.
Put the shredded lettuce leaves into a large mixing bowl and add the prawns, celery, apple and grapes. Spoon in the dressing and toss to coat. Taste and adjust the seasoning as necessary before serving.
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Recipes extracted from Gordon Ramsay’s Ultimate Fit Food by Gordon Ramsay, published by Hodder & Stoughton, £25