Spiced lamb burgers with herbed yoghurt This may not sound like an overtly Indian dish and in a way it isn't, but people in India have always eaten kebabs, either as they are or wrapped in flatbread. Ingredients For the burgers 1 small onion, quartered 4cm/1½ in piece fresh ginger 4 large garlic cloves 20g/¾oz fresh coriander, stalks and leaves 2-3 green chillies, chopped or ½-1 tsp red chilli powder 450g/1lb lamb mince ¾ tsp ground cumin 1½ tsp garam masala 1 tsp salt, or to taste 1 large free-range egg 2 slices thick-cut white bread, processed to crumbs in a food processor 2 tbsp oil, for greasing For the herbed yoghurt 200g/7oz Greek-style yoghurt 30g/1oz fresh coriander leaves 15g/½oz fresh mint leaves, or 1 tbsp good quality dried mint 1-2 green chillies, finely chopped (optional) salt, to taste ½ tsp freshly ground black pepper To serve 6 hamburger buns 1 onion, sli...