Don't think a great Steak can be beaten! Thinly sliced Rib Fillet or Porterhouse, cooked for just a couple of minutes' on each side!
All the other 'usual suspects' are good, 'cos it doesn't seem like a barbie without them! Always loved Pineapple Rings & Browned Onions!
A very easy side dish, perfect for a BBQ, is a packet of Frozen Mixed Vegetables, a packet of 'Shell' like Noodles, & mayonnaise. Steam or boil vegies. Allow to cool. Boil noodles. Allow to cool. once cooled, place in airtight container in fridge. Just when about to serve, add Mayonnaise, only enough to bind all together, not saturate food.
It's quick, easy to do, cheap, different & goes a long way!