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Put the lentils and stock or water in a large saucepan and bring to the boil. Reduce the heat and simmer for 20-25 mins, or until al dente. Drain and pour into a bowl. Add the celery, apple, shallots, walnuts, parsley and salad leaves, then mix together well.
To make the vinaigrette, put all the ingredients in a small glass jar with a lid. Season and shake well. Keep the lid on until ready to serve. Pour the dressing over the salad, toss well, then scatter over the blue cheese.