Fish and vegetable tagine

Ingredients

• 1 onion, chopped
• 2 cloves garlic, crushed
• 1 bunch coriander, leaves set aside
• 3 centimetre piece of ginger, peeled, chopped
• 1 tablespoon ras el hanout
• 1/4 cup vegetable oil
• 350 grams skinless boneless white fish fillets, cut into 8 pieces
• 300 grams kumera, peeled, chopped
• 1 red onion, cut into wedges
• 1 1/2 cup vegetable or fish stock
• 400 grams can chickpeas, drained, rinsed
• 1 zucchini, sliced
• 1 tomato, seeded, finely chopped
• couscous or quinoa, to serve