In candy-making, the goal is usually to prevent caramel from crystallizing. For this recipe, that's exactly what you want to do to in order to create the grainy, sandy-sugary coating beneath the chocolate. The pralines are also delicious when made with hazelnuts.
Alex Porter, chef at Norma's at Le Parker Meridien Hotel, concocted an incredible Chocolate Banana Waffle Napoleon. In his recipe, bananas are sauteed and layered onto waffles; the whole creation is then topped with chocolate and these candied nuts.