Related - they're much sweeter than a tomatillo, though, and you can eat them raw. (In fact, they're best raw.) The fruit is borne inside a husk, and is ripe when the husk is yellow/beige. They're kind of like cranberries in flavour, with a hint of pine.
GIS - to give you an idea what we're talking about.
In cooking, they're best in a coulis, like raspberries.