Chop the kale into small pieces.
Steam or boil the broccoli until just al dente and still green. Let cool.
Peel and dice the apple. Pour over a bit of lemon juice or vinegar and stir so it doesn't brown.
Peel and dice the kohlrabi.
Shave the brussel sprouts on a mandolin. Alternatively slice very very thin.
Roughly chop the hazelnuts.
In a large mixing bowl, combine the chopped kale, shaved sprouts, cooled-down broccoli, diced apple, diced kohlrabi.
Drizzle the hazelnut dressing over the salad and mix together until everything is well coated.