Except for the devilled eggs and string beans you won't see any of the above at an Aussie Christmas Lunch.
Here people generally go in one of two directions. They either do a traditional roast of they'll do a barbecue lunch.
If they decide to have a barbecue outside then all the side dishes and salads will be the highlight of the meal as there's not many ways you can make barbecued meat look fancy.
If they decide to do a traditional roast then it's going to be an elaborate spread with all the traditional trimmings. This does not include sweet sugary sauces. It also doesn't include turkey, in fact I have never met anyone that has ever cooked a turkey, I have only ever seen it precooked in shops. A traditional roast means Chicken, Pork, or Beef.
A proper roast comes with all the roasted vegetables including roasted potatoes, never mashed. And a thick gravy is made from all the juices in the bottom of the roasting pans to go over the meat and vegetables. And of course Yorkshire Puddings if the roast is beef.
The lunch is a 3 course meal, often starting with Prawn Cocktails as an appetizer, that's almost a tradition here now. The sauce used in a Prawn Cocktail is a mixture of Tomato Sauce, Worcestershire Sauce and Mayonnaise.
And desert is usually a choice between the traditional English Christmas Pudding or a Pavlova. The outer shell of a Pavlova is baked Meringue, this is filled with whipped cream and then topped with fruit and fruit syrups. Note - real cream that has been whipped is used here, never that ridiculously sugary fake cream.