if you are using dry beans wash and let them soak overnight in a pot filled with water.
Drain, put them in a pot with enough water to cover them and bring to a boil.
Reduce the heat and simmer, covered, for 30 minutes. Drain in a colander.
In a heavy pot, heat the oil and sauté the onion. Puree the tomatoes and dilute the tomato paste in the puree. Add to the pot. Then add the carrots, celery, green pepper, beans and seasonings.
Pour in 2 pints of hot water and bring to a boil. Reduce the heat and simmer, covered, for 1-2 hours or until the beans are cooked and the soup has thickened. Add more water if needed.
Serve hot, sprinkle with dry oregano and accompany with smoked fish or sausages.
