Place the cabbage into a bowl with the onion, carrots and mix well.
Put the yoghurt, mayonnaise, mustard and Herby Hog seasoning into a second, smaller bowl and stir until fully combined.
Tip the mayonnaise mixture into the chopped vegetables, and stir well, making sure the creamy dressing covers all the veg.
If you like your slaw extra creamy, just add extra mayonnaise and yoghurt.
Stir through the chopped chives and parsley and serve.
Add 100g cashew nuts, roughly chopped for added crunch.