Fragrant fish tagine

INGREDIENTS

• 2 tbsp olive oil
• 4 garlic cloves , roughly chopped
• 4 tsp ground cumin
• 2 tsp paprika
• bunch coriander , chopped
• 1 tsp salt
• juice and zest 1 lemon
• 8 x 100g skinless tilapia fillets
• 2 large onions , halved and thinly sliced
• 2 garlic cloves , sliced
• 2 tsp ground cumin
• 3 x 400g cans chopped tomatoes
• 500ml fish stock
• 175g pimento-stuffed olives
• 4 green peppers , quartered, deseeded and sliced
• 500g bag baby new potatoes , halved lengthways