Add the walnuts to a dry skillet over a low/medium heat and toast gently for 3-4 minutes until warm.
Roughly chop the lettuce and thinly slice the onion and celery. Add to a large serving bowl and toss to combine.
Slice the eggs into half inch thick pieces and roughly tear the anchovies. Arrange in the salad and scatter over the capers. Toss to combine.
Whisk together the mustard, water, lemon juice and oil until smooth.
Drizzle the dressing over the salad and stir gently to coat. Crumble over the toasted walnuts to serve.
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