Preheat the oven to 205°C. You want a hot oven to get that caramelisation, but not too hot that it burns the spices before the cauliflower is ready. Line a baking tray with parchment paper (or foil) and set aside.
Cut the head of cauliflower in quarters, trim away the core and gently break up the florets with your fingers, and cutting any larger pieces in half – more edges means more caramelisation. Try to keep the florets roughly the same size so that they cook evenly.
2 heads of cauliflower
Tip the florets onto the prepared baking tray and drizzle with the olive oil, followed by the spices and salt and pepper. Toss it all together with your hands (or a couple of spoons) so that all the cauliflower is coated in oil and spices. Make sure to leave some room between the florets so that they don’t end up steaming instead of roasting.
2 tablespoons olive oil, 1 tablespoon sumac, 1 tablespoon aleppo pepper flakes, ¼ teaspoon marjoram, ½ teaspoon garlic powder, Salt and pepper to season
Roast the cauliflower for 20 to 25 minutes, tossing the florets around the halfway time.
Serve the spiced roasted cauliflower straight from the baking tray or empty out into a serving bowl.