heat butter in large pan and cook the onion garlic and potatoes for 5min until lightly golden... add the cayenne and leeks and cook for a further 1min.

add stock bring to boil and simmer for 20min until the potatoes are very soft and beginning to break up in the soup.

use potatoes masher roughly mash the potatoes into the soup... stir in the chorizo and simmer gently for 5min until the orange coloured oil from chorizo rises to the surface of the soup... check the seasoning ladle into 4 bowls and serve with any crusty bread you desire... enjoy