How about a great big, fresh fruit bowl/platter to begin, with some big, juicy grapes - so quick, easy and cheap if you have a grocer/market nearby.

Grilled salmon or some other fish that isn't too difficult to mess up, with a very light side sauce (or butter and lemon).

(Alternatively, a juicy lamb roast and baked potatoes.)

Some kind of pie, put together earlier, so that you only need to put it in the oven.

A few bottles of Coonawarra-region Cabernet Sauvignon or Shiraz (or NZ Marlborough Sauvignon Blanc with the salmon)... Belgian beer if you want to get more seafoody...

Buy the dessert course and just worry about the appetiser and entree (or entree and main course, as we say here). ;D