Put 50gr couscous in a bowl, pour over 100ml boiling water, then cover with cling film. Leave for 5 minutes, then fork through. In a small bowl, mix the juice and zest of 1 orange, 1 tsp za’atar , ½ crushed garlic clove and 1 tbsp pomegranate molasses. Whisk in 3 tbsp olive oil and season to taste.
In a bowl, mix 150gr chopped spinach, 100gr pomegranate seeds, 2 segmented oranges, a large bunch of chopped fresh parsley and a large bunch of chopped fresh coriander. Lightly toast 50gr chopped walnuts in a pan. Cool, then stir into the salad with the couscous. Toss with the dressing, divide among 4 plates, then top each with the smoked mackerel fillets.