01 -
Slice the radicchio in half down the middle, take out the core, and cut into thin strips like coleslaw. Toss it into a big mixing bowl.
02 -
Cut the endives lengthwise down the middle, get rid of the core, and chop diagonally to make long, thin slices. Add it into the same bowl with the radicchio.
03 -
Turn each apple into fine matchstick pieces using either a super-sharp knife or the mandoline’s thinnest julienne option. Toss those in with the greens.
04 -
Whisk the mustard, salt, pepper, and vinegar together in a smaller bowl. Slowly stream in the olive oil while stirring vigorously until it blends completely.
05 -
Drizzle the prepared vinaigrette over the greens and apples. Tip in the crumbled cheese and the nuts, then give it all a thorough mix. Taste, sprinkle a bit more salt if needed, and enjoy it at room temperature.