Preheat the oven to 350 degrees.
In a medium bowl, cover the beans with water by at least 1 inch and leave them in the refrigerator for 6 hours or overnight. Drain.
In a large stockpot over low to medium heat, sauté the onions with the olive oil until the onions are translucent, 10 to 15 minutes. Add the garlic and cook over low heat for 3 more minutes. Add the drained white beans, rosemary, chicken stock, and bay leaf. Cover, bring to a boil, and simmer for 30 to 40 minutes, until the beans are very soft. Remove the rosemary branch and the bay leaf. Pass the soup through the coarsest blade of a food mill, or place in the bowl of a food processor fitted with a steel blade and pulse until coarsely puréed. Return the soup to the pot to reheat and add salt and pepper to taste. Serve hot.
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