Lamb, squash & apricot tagine

INGREDIENTS

• 2 tbsp oil
• 1 large onion , finely chopped
• 2 garlic cloves , finely chopped
• 1 tbsp ras-el-hanout
• 1 tsp ground coriander
• 600g lamb leg, diced into 2cm pieces, excess fat trimmed
• 200g butternut squash , diced
• 200g soft dried apricots
• 400g can chopped tomatoes
• 500ml lamb or beef stock
• zest 1 lemon
• small bunch coriander
• couscous and natural yogurt , to serve