Celeriac tikki with chickpeas

Name: Celeriac tikki with chickpeas
Cuisine: Asian, Indian
Ingredients: 1 large maris piper potato, peeled and cut into 4cm chunks; ½ celeriac, peeled and cut into 4cm chunks; ¼ tsp salt; ½ tsp Cooks’ Ingredients Chaat Masala spice blend, plus extra to serve; ½ tsp chilli powder; 3 tbsp cornfl our; 2 tbsp sunfl ower oil CHICKPEAS; 1 tsp black mustard seeds; 1 green chilli, fi nely chopped; ½ tsp salt; ½ tsp garam masala; ½ x 25g pack fresh coriander, leaves only, roughly chopped 400g can chickpeas, drained and rinsed TO SERVE; 4 tbsp natural yogurt; 4 tbsp mango and chilli chutney; Lemon wedges