Heat your barbecue for cooking over direct heat. Very finely chop the onion and put it in a bowl with the lamb mince, ras el hanout, harissa (if you want a hit of chilli), coriander and mint, and season. Use your hands to squeeze and mix everything together, then divide the mixture into 12-16 portions and roll each one into a ball. Mix the ingredients for the tahini sauce, adding a splash of water if it’s a bit too thick.
Thread the meatballs onto skewers, alternating them with padron peppers or chillies. Use two meatballs for short skewers, and three or four for longer ones.
The coals are ready when they’re ash coloured and glowing red. Cook the meatballs, turning the skewers every now and then so they colour on all sides – they should take 10 mins at the most. Put the lemon cut-side down on the grill to soften and mark it. When the skewers are cooked, briefly barbecue the flatbreads. Serve the skewers with the flatbreads, sauce, lemon, veg and the coriander, mint and chilli flakes scattered over, if you like.