Step 1

Preheat oven to 180C. Place walnuts on an oven tray and roast for 5 minutes or until brown.

Step 2

To make dressing, place mustard and vinegar in a small bowl, season with salt and pepper, and whisk to combine. Gradually whisk in oil until incorporated.

Step 3

Place radicchio, apples, onions and walnuts in a large bowl. Add dressing and toss to combine.