This Apulian caponata is a version of this one of Sicily’s essential dishes. It is a vegetarian eggplant stew–more like a relish, really–made of eggplant, onions, bell pepper, celery and tomatoes with briny olives and capers. There are variations of this tasty eggplant dish. Most of caponatas are spiked with vinegar or raisins. This version was…