In a large pot, sauté the onion, carrots, celery, and leeks in a bit of oil until softened.
Add the rinsed barley and vegetable broth to the pot.
Bring to a boil, then reduce heat and let it simmer for about 30 minutes, or until the barley is tender.
Add the seasonings (oregano, paprika, nutmeg, salt, and pepper) and the drained white beans (if using). Cook for another 10 minutes.