For the dressing
To serve
In a bowl whisk together the mustard, apple cider vinegar, honey and parsley.
Gradually add the walnut oil, whisking all the time, until an emulsion is formed.
Place the rocket, whole chicory leaves and walnuts in a large bowl, drizzle on the dressing and toss to coat. Season, to taste with freshly ground black pepper.
Serve immediately topped with a few pecorino shavings.