Heat a skillet over medium heat without adding any oil or butter. Roast the walnuts in the skillet for approximately 5 minutes until they turn golden brown. Allow them to cool on a plate, then roughly chop them.
In a large mixing bowl, whisk together the mustard, honey, and vinegar until they form a smooth mixture. Gradually pour in the oil while continuously whisking. Season the dressing with salt and pepper according to your taste.
Trim the ends of the chicory stalks. Cut each chicory head in half lengthwise, remove the tough core, and then slice the chicory lengthwise into thin strips. Slice the celery into approximately 1 cm thick circles.
Slice the apple into wedges, remove the core, and then dice the flesh into cubes around 1 cm in size. Cut the cheese into similar-sized cubes. Finely chop the celery.
Combine the chicory, celery, three-quarters of the chopped walnuts, diced apple, cheese, finely chopped celery, and raisins in a large bowl. Pour the dressing over the mixture and toss until all ingredients are evenly coated. Sprinkle the remaining walnuts over the top before serving.
Enjoy!
Notes
Nutritional values are approximate and may vary depending on specific ingredients and portion sizes.