- 1 large ham hock (about 3/4 pound)
- 3 quarts plus 1 cup water
- 1 pound dried black beans, picked over
- 1 red onion, chopped (about 2 cups)
- 1 bay leaf
- a 28-to 32-ounce can whole tomatoes with juice, chopped
- 3/4 teaspoon salt, or to taste
- 1 to 2 tablespoons fresh lime juice
- lime slices
- In a 5-quart kettle simmer ham hock in 3 quarts water, covered, 1 hour. Add beans, onion, and bay leaf and simmer, uncovered, 1 hour, or until beans are just tender. Stir in tomatoes with juice, salt, and remaining cup water and simmer soup 45 minutes, or until beans are tender. Soup may be made 1 day ahead, cooled completely, and chilled, covered.
- Remove ham hock and reserve for another use. Discard bay leaf and stir in lime juice to taste. Divide soup among 8 bowls and garnish with lime slices.