Caramelized Onion, Eggplant, Olive, and Kale Calzones

For many of you out there, the thought of turning on the oven makes you almost swoon. In fact, some of you are already swooning because of the heat. If this is you, bookmark this recipe and come back to it this fall when the eggplants are beginning to shrivel on the plant but are still quite good and when the kale is a little wilty but still edible. Or better yet, defy the heat and make this tonight: but put it inside a Campfire Foil Pack and toss this on the grill (or even better yet, a campfire). However, in the Bay Area, we are getting the August fog, that wall of cool, wet weather that makes me almost shiver, not from the cold, but in delight. In fact, tonight as we were driving (to Target for cat litter and Kleenex if you must know the boring details of my daily life), the wall of fog was firmly planted just on the edge of the Bay at the Oakland border. It will creep in, not on little cat's feet as Carl Sandburg suggested , but in puffs ...