Mix the slow cook ingredients (apart from the garlic bulb) together in a bowl with clean hands. You need to knead it with your hands until everything is fully combined and the meat is smooth.
Put the meat mixture onto a sheet of tin foil and shape it with your hands into a brick/log type shape. Roll it up very tightly, twisting the ends of the tin foil like a sweetie wrapper to secure. 
Take the unpeeled garlic bulb (yes a whole bulb!) and wrap up in tin foil.
To cook in the Slow Cooker:
Put the wrapped meat and wrapped garlic in the bottom of the slow cooker. Prick the wrapped meat with a sharp knife a few times.
Cook for 3-4 hours on HIGH or 5-6 on LOW or until cooked through when you test the internal temperature with a meat thermometer (see notes).
To cook in the Air Fryer:
Put the wrapped meat and wrapped garlic in the air fryer. Prick the wrapped meat with a sharp knife a few times.
Cook for 30 minutes at 170℃/325F.
Remove the garlic bulb from the air fryer and set aside to cool. Open up the foil top of the kebab meat to allow the top to brown. (Do this carefully so that the cooking juices don't run out of the bottom of the foil.)
Cook the meat for a further 15 minutes at 170℃/325F or until cooked through when you test the internal temperature with a meat thermometer (see notes).
To Serve:
Let the meat sit to cool for 15-30 minutes (save the juices at the bottom of the slow cooker or foil if cooked in the air fryer).
When the meat has cooled slightly, unwrap it and use a very sharp knife to slice very thin strips. Drizzle over the meat juices (this is important as it will be quite dry without this).
Make the garlic sauce by squeeze the cooked, very soft garlic from its skin. Just hold the bulb and squeeze from the bottom and it will squish straight out. Add the mayo, yoghurt and mint sauce, mix well. Add a splash of water if you'd like it to be more runny.
Serve the meat as it is with the usual kebab accompaniments and the garlic sauce, OR reheat the meat, with the cooking liquid in a frying pan for a few minutes until hot through (see notes).
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