Mix all the ingredients together to make the yoghurt sauce, and season to taste. Refrigerate for 20 minutes before use.
Cook the bulgur wheat with 100ml of boiling salted water for 8-10 minutes until it's soft and has absorbed all the water. Allow to cool completely.
Heat the olive oil over medium heat and gently soften the onions with a pinch of salt for 8-10 minutes until almost translucent. Add the garlic and chilli and cook for 2-3 minutes. Set aside and leave to cool completely.
Preheat an overhead grill or barbecue to medium-high heat.
Mix the lamb mince with the bulgur, cooled onion mixture, mint, and kebab seasoning in a large bowl. Season with salt.
Divide into 8 balls, then thread onto skewers. Mould the koftas into an even thickness along the skewers using your hands.
Grill the skewers for 8-10 minutes, then turn over and cook for another 8-10 minutes. Allow the skewers to rest for 5 minutes, then serve with mint yoghurt, flatbread, and a large salad.