Fish Ajiaco

In Colombia, ajiaco is a soupy stew in which the main ingredients are several kinds of potatoes, corn, guascas – a local herb – and aji, or hot sauce. Traditionally, chicken is added, but in the past I have made an entirely vegetable-based ajiaco, which is very good indeed. Now try it with fish; this is possibly the best variation of all. You cannot, I think, get guascas here, which is why I have always called my chicken version