Fry chorizo in batches in a little oil, removing to a plate once done. (Chorizo should be as crisp as possible.) Add potatoes and salt to the frying pan and fry for 1 minute or until slightly browned. Tip into a bowl, scraping any crunchy bits in as well. Add beans, capsicums, remaining oil and sherry vinegar. Toss well. Scatter chorizo on top.