On top of all that...

Onions are an essential counterpoint to the meat, the main area of variation will be the manner in which they are sliced. It's fair to say there is no right or wrong method , some like a fine cut, 'stringy' texture, whereas otherwise will prefer the crack-like hit of large chunks scattered throughout the 'bab
Lettuce, often finley sliced or shredded provides a bed for the meat, normally the lettuce will go on top of the meat though some places will make a lettuce 'bed', add meat and then a final layer of lettuce afterwards
Tomatoes bring a vital colour and balance to the kebab, slicing methods vary from one establishment to another
The noble cucumber. Sometimes sliced, sometimes diced. Diced is nice
Cabbage, often a mixture of red and white is lovely, most cabbage has little taste
Chilli sauce is critical for the late-night bite but may overpower a mild doner. The best sauces are freshly made and come from a silver bowl rather than a plastic bottle. Personally I go on and off chilli sauce.
Garlic sauce can provide a classic counterbalancing effect to a hot chilli, when this yin-yang balance is achieved, inner happiness will follow
Steve from Yorkshire writes 'I'm a Yorkshireman, originally from York, now in Huddersfield, but I spent 4 years in London. In Yorkshire, if you go for a kebab, alongside the bowl of chilli sauce there's a bowl of yoghurt. Whenever I was asked in London if I wanted chilli sauce, and I said "no thanks, just yoghurt", I got the funniest looks - just like when I asked for mushy peas in the chippy.'
These pickled chillies vary enormously in size, colour and taste. The best are crunchy and fresh-tasting with a sharply acidic taste, the worst are limp and often appear rotten inside. These things are so widely available and in such varying quality that they merit a discussion all of their own. I recently bought a jar of these from my local turkish grocer's, if anyone's interested I can heartily reccomend 'Olymp' brand pickled green chillies. I have now bought a second, larger jar which you can see here
I prefer this applied straight on the meat though the man will invariably try and spray it over the salad.All the salad and lemon juice but no sauces provides that 'classic' kebab experience letting the meat do the talking, as it were.In the home I use Cypressa Brand It is the best thing ever to put on a salad