Add the turmeric and pink salt to a medium sized saucepan and bring to the boil.
Once boiled, carefully lower the cauliflower downwards into the water.
Par boil for 5 minutes or until the cauliflower is almost tender (keep an eye on the cauliflower and test it with a fork to make sure it isn't extremely soft).
Drain off the water and briefly rinse with cold water (this will prevent the cauliflower from cooking any further) and then blot dry with kitchen towel and set aside.
Meanwhile, add the nutritional yeast, onion/garlic granules, parsley, thyme, turmeric, pink salt and black to a spice/coffe grinder.
Mill the ingredients until they are ground.
Mix the vegan butter with the dry ingredients and stir until evenly combined.
Do a test taste of the mixture and adjust with more spices/herbs, if needed.
Use a pastry brush to coat the cauliflower with the buttery mixture (don't worry if it starts to melt as you apply, that's normal), making sure to include in between the florets as best as you can.
Place the marinated cauliflower in the air fryer basket ( you may want to line it in advance).
Air fryer at 180C/356F for 12-15 minutes until the cauliflower is fork tender (test it with a fork to determine its readiness) and golden in colour.
Prior to serving you can slice into the cauliflower and coat the inside with any leftover buttery mix to enhance the flavour even more.