Here's one I like a lot, haven't made it in a long time. Thin sliced "good" apples like a honey crisp variety. Thin sliced sweet onions, crumbled gorgonzola, drizzle some creme fraiche all around with a squirt bottle, a sprinkle of sea salt and some fresh cracked pepper and then some mozz and parm. Some chopped fresh rosemary on top last so the heat gets it. This makes a great starter pie. First time I had it was at a Persian place where everything is cooked in wood fired ovens or grills. It was our starter plate to share before the main courses.