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.
We use crisp radishes for a bit of crunch and spiciness in this Crab Salad Sandwich. You can also use chopped fennel, celery, thinly sliced fresh apple, or matchsticks of jicama as alternatives.
