Pre-heat the oven to 220C/425F degrees
Trim the outer leaves of the cauliflower and trim the stalk so that it can stand upright on a baking dish.
Place the cauliflower on a parchment paper lined baking tray or dish.
Melt the butter and mix with the olive oil.
Add the garlic powder, mustard, lemon juice & rind, salt and pepper.
Brush the butter mixture all over the cauliflower.
Bake in the oven for an hour until tender. Baste occasionally. Test it by inserting a skewer into the centre of the cauliflower. It should pass easily and you can feel if it is tender.
Remove from the oven, sprinkle with the Parmesan cheese and place back into the oven for 5-8 minutes.
Sprinkle the chopped parsley over the cauliflower and serve.
Eat and enjoy!