01 -
Cut the radicchio in half through the stem and remove the core. Thinly slice crosswise as you would for slaw and place in a large bowl.
02 -
Slice each endive in half through the core, remove the cores, and slice at a 45-degree angle to create long shreds. Add to the radicchio.
03 -
Using a knife or mandoline set to the thinnest julienne setting, cut each apple into matchsticks. Add them to the bowl with the sliced greens.
04 -
In a small bowl, whisk together the vinegar, mustard, salt, and pepper. Gradually whisk in the olive oil until fully emulsified.
05 -
Pour the vinaigrette over the salad ingredients. Add the crumbled Roquefort and caramelized nuts, then toss everything well. Sprinkle with additional salt if desired, and serve at room temperature.