Vegetable oil, for frying1 onion, finely
chopped1 celery stick, finely chopped2 garlic cloves, crushed1 tsp ground coriander30g fresh ginger, finely chopped500g sweet potatoes, cut into 1 cm cubes500ml fresh chicken stock200g cooked chicken, shredded3 tbsp Greek yogurt, to serveFresh coriander, to serve1 lime, juiced, to serve Heat a glug of vegetable oil in a large saucepan.