1Heat the olive oil in a large pot over medium heat.
Add the chopped onion and minced garlic, and sauté until the onion is translucent.
Add the beef stew meat to the pot and brown on all sides.
Stir in the cumin and paprika, and cook for another minute.
Add the sliced carrots, chopped celery, and chopped bell pepper to the pot. Cook for about 5 minutes, stirring occasionally.
Pour in the beef broth and diced tomatoes. Bring the mixture to a boil.
Reduce the heat to low, cover the pot, and let it simmer for about 45 minutes, or until the beef is tender.
Add the sliced blue plantains to the pot and cook for an additional 15 minutes, or until the plantains are tender.
Season the soup with salt and pepper to taste.
Serve hot and enjoy your Beef and Plantain Soup!