Preheat the oven to 400ºF or 200ºC.
Prepare the spices in a bowl.
1 teaspoon garlic powder, 1 teaspoon dried thyme, 1 teaspoon salt, ½ teaspoon cumin powder, ½ teaspoon paprika powder, ½ teaspoon turmeric powder, ½ teaspoon ground pepper
Mix all the ingredients in a bowl, but the cauliflower, until well combined.
4 tablespoons water, 3 tablespoons tahini, 1 lemon
Trim the base of the cauliflower to remove any green leaves and the stem.
1 medium cauliflower head
Make cuts in the cauliflower head and then rub the marinade all over the cauliflower, allowing some of it to come inside of it.
Place onto an aluminum foil and bake for 1 hour.
Remove from the oven and open the aluminum foil and place back in the tray uncovered to allow the top side to become golden brown.
I like to add the remaining juices in the aluminum foil on top of it once I have cut it in quarters.