Elsewhere in the Netherlands a similar pastry is sold as a moorkop, but a Bossche bol is larger and fully coated in chocolate rather than just dipped on top.
A choux pastry ball roughly the size of a fist is filled generously with whipped cream and coated almost entirely in dark chocolate fondant. Bakeries in 's-Hertogenbosch (Den Bosch) have sold them for around a century, and they've become the city's signature sweet.