Pita Pizzas with Caramelized Onions, Dried Cherries, and Gruyere

Here's another of the hors d'oeuvres I made for Sharon and Tony's wedding reception last Friday night. I especially like this one since it doubles as a simple meatless main course. If you can't find pocketless pitas, you can also use store-bought naan bread (which they've started selling at Costco) or pizza crusts. If you'd