If desired, soak overnight in water to cover:
Drain and place in a soup pot with:
Bring to a boil, then reduce the heat and simmer, covered, until the beans are tender, about 1 hour 15 minutes for soaked beans and 2 hours for unsoaked. Discard the rosemary sprig and stir in:
Heat the mixture through, seasoning with:
Garnish with: