[header] How to make white bean gratin [title] Rinse and drain your soaked beans and place them in a pan with enough water to cover them by 1 " or so. [step] You'll want to keep this level, as the beans cook, feel free to add more water from time to time. [title] Add in your onion and bay leaves. 
[step] Bring to a boil and immediately reduce your heat to an' aggressive simmer'. Cook until your beans are tender but not falling apart.