They’re the buds of a caper bush, and while they taste vegetal, like olives, they’re technically considered a fruit. Capers grow predominantly in the Mediterranean, as well as in parts of Asia ...

The tangy, bitter flavour of capers adds piquancy to many sauces and condiments, such as tartare sauce, and they are a good match for fish. They can be used as a garnish for meat and vegetable ...

And I know what capers are, the edible flower buds of the caper bush (also known as Flinders rose), which are often pickled.