Preheat oven to 180°C.
Trim green ends off cauliflower head, leaving the stem intact. Chop head into 6 wedges.
Slice peppers in half lengthways, remove stem, and clean inside of seeds and additional soft white skin areas. Cut peppers again in half lengthways so you end up with 4 slices per pepper.
Peel onions and cut in half.
Cut tomatoes in half.
Combine olive oil, za'atar, oregano, sumac, smoked paprika and cumin.
Spread cauliflower wedges, peppers, tomatoes, onion and garlic bulbs evenly over a large roasting tray. Pour over oil and using your hands gently rub into vegetables.
Transfer to the oven and roast for 50 - 60 minutes or until vegetables are charred and juicy.
Meanwhile, cook rice in salted water.
Using a dry frying pan, lightly toasted almond flakes along with 3/4 tsp za'atar.
Stir butter through hot rice, followed by toasted almonds. Cover and keep warm.
Remove roasted cauliflower from the oven. Serve vegetables alongside butter almond rice. To finish, spoon spicey chilli oil from the bottom of the roasting tray over vegetables and rice.