Dutch sandwich topping that consists of small pellets of chocolate (diameter 0.5 to 1 mm, length 2 to 5 mm). Non-Dutch people migtht have encountered the stuff as decoration on chocolate cake. When using it on your bread make sure to use butter, too, to prevent the hagelslag from falling off.

Hagelslag is available in many flavours: milk chocolate, plain chocolate, white chocolate, mocha... there is even something called vruchtenhagel ("fruit hail") that looks like hagelslag only in yellow, pink and orange. Or green (apple flavour, yuck). This stuff has nothing to do with chocolate OR fruit, but consists of sugar and food colouring.