In a bowl, mix together the lamb or beef mince, grated onion, minced garlic, and spices. Season with salt and pepper.
Shape the meat mixture into a compact loaf or cylinder shape.
Place the meat in the air fryer basket and cook at 400°F (200°C) for 15-20 minutes, flipping halfway, until the meat is cooked through.
Slice the cooked meat into thin strips or shavings.
Warm the pita bread or flatbread in the air fryer for a few minutes.
Assemble the doner kebab by placing the sliced meat, lettuce, tomatoes, onions, and tzatziki (or other desired toppings) inside the warm bread.
