In a large pan, place the dried butter beans to soak overnight (or at least 8 hours) – covered by about five or six-inches of cold water the night before cooking. In the morning, rinse the beans and discard the water they soaked in. Bring a new pan with cold water to a boil and add the beans, add a bay leaf and simmer. Cook until al dente – not quite yet soft but almost – drain and set to one side. This will take approximately one hour, more-or-less.