For a light entree on a summer night, this dish is just the ticket. Salting and draining the zucchini and tomatoes before baking prevents them from releasing excess moisture as they bake, so the gratin stays firm, not soggy.
We used whole-grain bread to make this sandwich, but the combination of fresh vegetables and cheese also works well tucked inside pita bread or a whole-wheat wrap.
I made this on a whim one Sunday morning when friends called and said they planned to drop by in the afternoon. It makes a lot, and I was able to serve our friends and the neighbors a casual supper. The seasonings and green chilies give the meat a spicy kick and taste fantastic with cool sour cream and fresh salsa.
