In a large pot, heat the oil over medium heat. Then add the onions and cook for 3 to 4 minutes or until the onions are translucent. Add the tomatoes, garlic, scallions and cook for another 3 minutes.
Add the pork belly, stir and cook for 2 minutes more. Add the beans, carrots, cumin, color and water. Bring to a boil. Then cover the pot and reduce the heat to medium- low and cook for about 1 hour.
Add the plantains and cook for 45 minutes to 1 hour or until the beans are cooked. (Add additional water, as necessary.)Add salt and pepper, stir and serve.