roast pork - cooked the night before - gravy
roast beef - cooked on bbq rotisserie - seperate gravy
roast lamb - cooked in the oven or on rotisserie - depending on whether it's rolled or not - seperate gravy (or may combine with the beef
ham
bbq chicken (only cos my dad has had surgery and can't eat the other meats) - bought the night before (or that morning - we have a shop that opens Christmas morning)
might have prawns with garlic sauce - depends on whether bro and DH decide on it a day or two before hand

basic salad - prepared the night before

roast potatos - if we're being slack, we'll buy a bag or two from the supermarket (frozen) and chuck them in the bbq under the meat while it's cooking
vegie bake - a bit of everything (cauli, broc, carrot, onion, swede, turnip, whatever else we have at the time) fried gently in garlic butter, then covered in white sauce. last year this was made three weeks in advance, frozen, taken out christmas eve and cooked christmas day
pea and corn

general snacky food

if someone has a particular request, we try to accommodate, but we all have similar taste and tend to enjoy it like this. very little preparation on the day. we all chip in to help in the time leading up to Christmas...