Bring beans and 4 qts. water to a boil in a large pot. Reduce heat to medium-low, add salt, and simmer gently, stirring occasionally. Add more water as needed to keep beans covered while cooking them for about 2 to 3 1⁄2 hours, depending on how old the beans are. Adjust salt as needed. I like a minimum of 2 cups of the remaining broth in the cooked beans.
Serve alone or garnish with fresh chile, cilantro, and feta cheese.