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