This is one of my favourites, and it's a Weight Watchers Special, almost zero points, if you know what I'm saying. I'm making it right now, for my supper.
Grilled Veggie Sandwich: Toast one slice of Focaccia bread, split horizontally. It doesn't matter when you prepare the toppers, ahead of time or as you pile them on, but you want to build on the foundation with slices of the following on each side, preferably in this order going up: grilled red onion (splash of balsamic vinegar), eggplant (peeled and grilled), red pepper (grilled and peeled), broiled portobella mushroom (broiled, stem and gills removed (freeze them for soup stock), topped with grated mozzarella chess, or whatever you have or like, then broiled until the cheese melts. You don't really need any other seasoning with this; it's all good.
I find one half is usually enough, but of course you can eat the whole thing. I just wrapped my other half in foil and I'll have it for lunch tomorrow.