Look for caper berries near the olives in the supermarket; they should be next to the capers, but they're much bigger and have a stem. In a pinch, substitute about a tablespoon of chopped capers. Japanese eggplants have thinner skins than typical globe eggplants, so you can leave the peel on. The light purple color is pretty, too.
View Recipe: Grilled Caponata Salad with Grilled Flatbreads