Preheat the oven to 200 °C. Divide the cauliflower into florets and lay them out on a baking tray. Drizzle with a little olive oil, salt lightly and roast in the oven for approx. 25 - 30 minutes.
Peel the onions, cut them into rings and roast them with 4 tbsp olive oil in a pan on high heat. Add a pinch of salt and 2 tsp sumac and roast for about 5 minutes until the onions are nicely cooked.
Coarsely chop the almonds and parsley.
Divide the hummus and sumac onions between plates and top with roasted cauliflower.
Spoon the amba over the hummus and cauliflower. (You don't have to use the whole amba sauce) and garnish with olive oil, almonds, parsley, sesame seeds, black cumin.