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Discard any discolored beans. In a large bowl, combine
the beans with plenty of cold water and soak overnight for 6 to 8 hours.
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Drain the beans. In a large pot, combine the beans
and enough water to cover them by 1 inch. Bring to a boil, lower the
heat to simmer, and cook for 45 minutes or until they are just tender
(it may take longer if the beans are old or the soaking time was short).
Drain the beans and set aside the cooking liquid.
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Set the oven at 325 degrees. In a bean pot or deep
casserole with a lid, combine the beans, onion, mustard, dark and light
brown sugars, molasses, and salt. Add enough of the cooking liquid
to just cover the beans. Stir to blend them.
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Bring the liquid to a boil on top of the stove, then
transfer to the oven and bake for 2 hours, checking every 30 minutes
to make sure the beans don't dry. Add more cooking liquid if necessary.
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When the beans are tender, uncover the pot and cook
for 20 to 30 minutes more to make a slightly crusty top.