Mary Berry's aubergine five-nut roast recipe is a reall winner for vegetarians. It's so easy to make and tastes delicious too - you can prepare it in advance or the day before you want to serve it so you've got plenty of time to focus on the sides.
Butternut Squash, Spinach, and Goat's Cheese Pie from Delicious Magazine. A vegetarian pie recipe made with seasonal autumn vegetables and goat's cheese in a cheesy pastry. The pie is freezable so you can make it ahead.