I am doing a big dinner (75-100 people) and macaroni and cheese (Martha Stewart recipe, I've made it many times) is going to be the main dish.
The remainder of the menu will be:
green salad with lemon vinaigrette
roasted cauliflower and broccoli, maybe some other vegetables
Dessert will be pear upside down cake and vanilla ice cream.
I am looking for one additional dish to serve with dinner. I am hoping to think of something that has no gluten or dairy, and can serve as a main dish for those who don't want mac & cheese, or a side dish for the vast majority who do. Ideally, it could be made ahead and frozen (the mac & cheese and cake will both be frozen ahead) or something that is quite quick to prepare in advance. I can't serve meat and prefer something vegetarian, but would consider fish.
Any ideas are appreciated.