I used to have the chili con carne recipe from San Quentin Prison; the warden sent it to me in the 1960s when I worked at Howard Johnson's. Unfortunately, I lost it, but it was very similar to this ...

This is a really easy chilli con carne recipe. It has loads of flavour ... until the mixture is rich and thickened. Add the kidney beans and fresh coriander. Cook for a further 10 minutes ...

Stir in the beans, then cook the chilli for an hour more until the meat is very tender. Pop the chocolate into the chilli, let it melt, then stir. Season the chilli to your taste, then scatter ...