How to Make It
Soak the beans overnight in a bowl of cold water. (Alternatively, in a large saucepan, cover the beans generously with cold water and bring to a boil; simmer for 2 minutes, remove from the heat, cover and let sit for 1 hour.) Drain and rinse the beans; transfer them to a medium flameproof casserole. Add 1 quart of water, the onion and green pepper and bring to a boil. Reduce the heat to low and simmer for 45 minutes. Add the clam juice, cover partially and simmer, stirring occasionally, until the beans are tender, about 40 minutes.
Add the clams. Cover the pan tightly and cook over moderate heat; remove any opened clams after 5 minutes and check every 2 minutes thereafter. There should be enough liquid to keep the beans moist; add a few tablespoons of water if needed.
Spoon the beans and clams into warm bowls, garnish with the parsley and serve.