This is a Greek street food that is very popular in Australia. In each state you will find it called something different however South Australia seems to be the only one to use the term 'yiros'. It is a popular late-night feast after a big night 'on the grog'. The standard salad ingredients are lettuce, raw onion and tomato topped with a garlic (but not tzatziki) sauce. Tabbouli, cheese and chili sauce are also popular fillings as are chicken, beef and falafels. Which ever meat is used it is cooked by stacking thin slices of marinated meat on a vertical skewer which turns in front of a heat source. The meat is then carved vertically from the skewer so the meat is in very thin shards. This is my version. I have used tzatziki as I have yet to discover the secret of South Aussie garlic sauce! Australian measurements used.