Heat the oil in a large pot over medium heat. Add the beef and pig tail (if using). Brown the meat on all sides.
Add the chopped onion, garlic, green bell pepper, red bell pepper, and celery to the pot. Sauté until the vegetables are softened.
Stir in the tomato paste, soy sauce, thyme, and bay leaves. Cook for a few minutes until the tomato paste is well incorporated.
Pour in the beef or vegetable broth. Bring to a boil, then reduce heat to low. Cover and let it simmer for about 1 hour, or until the meat is tender.
Add the carrots, potatoes, pumpkin, yams, and dasheen (if using) to the pot. Season with salt and black pepper. Continue to simmer until the vegetables are tender, about 30 minutes.
Adjust seasoning as needed. Stir in the chopped parsley just before serving.
Enjoy your meal!