Rinse and sort the beans, then soak them in water overnight.
In a large pot, sauté the onion and garlic until softened.
Add the drained beans, vegetable broth, oregano, salt, and pepper. Bring to a boil, then reduce heat and simmer for about 40 minutes, or until beans are tender.
Serve hot.
Notes
This soup can be stored in the refrigerator for up to 3 days. Feel free to add other vegetables, such as carrots or celery, for extra flavor and nutrients.