Caperberries are the fruit the caper plant produces if you don't pick off all the flower buds. The berries are slender, firm, and not at all sweet. They're salt cured alongside the capers so they have a similar briny, green flavor with a citrusy note all their own.
You can use caperberries the same way you'd use olives without having to deal with the pits. Include them in a tapas spread, dice 'em up for salads, pair with poultry, or try shaking up a caperberry martini.