Coarsely chop the walnuts. Mix cider, vinegar, some salt and pepper. Stir in walnut oil and walnuts. Drain the beetroot and cut into strips. Cut Roquefort into large pieces.
Clean and wash the chicory and remove half of the leaves individually. Place the chicory leaves on two plates and cut the remaining chicory into rings. Clean the lamb's lettuce, wash thoroughly and drain.
Wash, quarter and core the apple. Cut the apple quarters into slices. Mix the apple slices, lamb's lettuce, chicory pieces and beetroot with the cider vinaigrette. Arrange Roquefort pieces on the chicory leaves and serve immediately.