Preheat the oven to 200℃/390F fan, 220℃/430F / Gas mark 7.
Place all the kebab ingredients in a bowl, apart from the oil, with a good pinch of salt and pepper, and mix together well with clean hands.
Line a large baking tray with baking parchment, brush the oil on and press the mince mix out evenly into a large rectangle.
Use a knife or a dough scraper to cut the rectangle into long 3cm wide strips, then indent the mince all over with shallow lines. This helps the kebabs cook evenly.
Cook for 15-20 minutes until the meat is brown and cooked through. (If you find your mince has released a lot of liquid, carefully drain this off with 5 minutes to go.)
While the kebabs are cooking, toss the sliced onion with the juice of half the lemon and a pinch of salt. Set to one side to make quick pickled onions.
Stir the yoghurt and garlic cloves together and season to taste.
Serve the kebabs on flatbreads with the yoghurt, cucumber, pickled onions and a final scattering of parsley.
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