My favorite grilled veggie sandwich:
Get (or make) two nice loaves of rustic bread.
Slice relatively thickly:
2 summer squash
1 big vadalia onion
4-5 big tomatoes
Coat with olive oil and season with salt and pepper. Grill.
Slice open loaves, layer veggies, and top with crumbled farmer's cheese. Cut into sandwich sized pieces. Eat up, or wrap in tinfoil and stick them in an insulated bag for a picnic lunch.