Preheat the oven to 180ºC.
Trim the cauliflower stalk so that it can stand level.
Zest the lemon into a separate bowl and set aside.
Add the garlic to a mortar and pestle and smash it a bit.
Then add the paprika, thyme, cumin, turmeric and olive oil. Smash it all into a rough paste, then mix in the salt and pepper.
Rub the paste all over the cauliflower, place it in an oven dish and squeeze the lemon juice over it.
Cover with foil and put in the preheated oven for an hour.
Remove the foil and bake for another 20 minutes.
Remove the cauliflower from the oven, sprinkle the lemon zest over it, and return to the oven for another 10 minutes.
Drizzle with some olive oil before serving.