Annual party, and every year I vary the menu, but always want a pasta dish, preferably vegetarian this year (no other big veg main courses). I've done variations on pesto, variations on tomato based sauces, and two years ago did a citrus cream sauce that was a huge hit. This year, I'm out of ideas. Because of things in the oven, want something that can be made on the stovetop too.
Other things on the menu include pork tenderloins with balsamic chestnut glaze, and a potato-mushroom gratin, and either a green bean/white bean salad or a green been, beet and radicchio salad.