El Submarino - Argentinian Chocolate Drink

"This is a fun and easy hot chocolate. El submarino is an Argentinian treat -- a mug of hot milk with a thick rectangle of dark chocolate served alongside. The chocolate is the submarine, and you sink it into the hot milk. As you stir, the milk becomes hot chocolate, and if you do it right, a nice treat of melted chocolate sludge waits for you at the bottom of the cup. Kids love to do this. A simple but great way to make this warming winter drink."