Chicken tagine

INGREDIENTS

• 125g/4½oz green olives
• 100ml/3½fl oz olive oil
• 1 large onion
• 4 chicken breasts
• 2 garlic
• 1 tsp ras-el-hanout
• ½g saffron
• 1 tsp ground ginger
• 1 tsp freshly ground black pepper
• 1 large preserved lemon, peel only, chopped
• 3 tsp chopped fresh coriander
• 1 tsp chopped fresh parsley
• , to serve vegetables