This is one of those genuine Argentine treats you can order in the afternoons. This is a submarino, which is a version of hot chocolate. You order the drink and usually the waiter brings you piping hot milk and a chocolate bar--either already in the milk or waiting for you to drop it in on the side as in the photo. After several minutes and a little stirring, the chocolate melts creating a wonderful hot beverage.
My friend Lindsay is addicted to them. According to her, the best part is that the chocolate doesn't completely dissolve. Then at the end you're left with a "chocolaty" treat with all of the little chocolate pieces that float to the bottom. I'd have to agree; it's quite tasty.
I don't know why it gets its name as a submarino. However sometimes the chocolate is shaped like a submarine. However since I've been looking for one of these elusive bars of chocolate, I haven't been able to find one!
Make one of these tasty Argentine treats at home to give you a version of the Porteño life!
Pictures courtesy of my friend Ronald, since I didn't have my camera with me.