Kemp's Black Beans

Ingredients

1 lb dried black beans (about 2 1/3 cups), picked over and rinsed (but not soaked)
1 medium onion, finely chopped
3 tablespoons olive oil
8 cups water
1 1/2 teaspoons salt
1/4 cup Sherry (cream or medium-dry)
1 to 2 tablespoons soy sauce
1 to 2 tablespoons balsamic vinegar

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