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.
This is one of the dishes Grandma served to our family during the holidays. Now, when the family gathers and I prepare this for my grandchildren, memories of those special times at Grandma's house fill my mind. I usually double this recipe, because the leftovers are fabulous when warmed in the microwave.