Spiced chicken, tomato and lentil soup | Gourmet Traveller

Ingredients

• 1 chicken (1.6 kg)
• 1 litre (4 cups) chicken stock (see note)
• 30 gm butter, coarsely chopped
• 1 tbsp olive oil
• 1 large onion, finely chopped
• 3 garlic cloves, finely chopped
• 40 gm (8cm piece) finely chopped ginger
• 2 tsp ras el hanout (see note)
• 400 gm whole canned tomatoes
• 180 gm black lentils, rinsed (see note)
• 260 gm peeled celeriac (about ½), diced
• Pinch of saffron threads
• ¼ cup each finely chopped flat-leaf parsley and coriander
• To serve: thick plain yoghurt