Clean, wash and spin dry the oak leaf lettuce. Tear the lettuce leaves into bite-sized pieces.
Mix together apple cider vinegar, water, table horseradish, a little salt, pepper, honey and oil. Peel and finely dice shallot. Quarter and core the apple and cut into thin wedges. Mix the shallot cubes and apple wedges into the vinaigrette. Serve the salad with the sauce and the garden cress.