Slice the cauliflower into 3 cm thick steaks. Place on a baking tray, drizzle with olive oil, cover with aluminum foil and bake in a hot oven at 200°C for 10 minutes. Remove from the oven and leave the foil on top, allowing the cauliflower to steam until cool.  Uncover, sprinkle with ras el hanout, paprika and garlic powder and roast uncovered in the oven for 10 minutes on both sides. Meanwhile prepare the caramelized onion by cooking with a knob of butter until soft. Add in the brown sugar and cook down for 10 minutes to caramelize. Make a dressing by mixing together the orange and lemon zest and juice, together with the extra virgin olive oil and tahini. Meanwhile, slice and grill the halloumi cheese. Serve the cauliflower steaks topped with the caramelized onions, grilled halloumi cheese. Drizzle over the citrus dressing and sprinkle with pine nuts.