Wash the oxtail pieces and pat dry.
In a bowl, mix browning sauce, Worcestershire sauce, soy sauce, salt, pepper, and allspice. Rub this mixture all over the oxtail.
Heat oil in a large pot over medium-high heat. Add oxtail pieces and brown on all sides.
Add chopped onions, garlic, and Scotch Bonnet pepper to the pot. Sauté until onions are translucent.
Pour in beef broth and add thyme sprigs. Bring to a boil, then reduce heat to low, cover, and simmer for about 2 1/2 hours, or until the oxtail is tender.
Add the drained butter beans to the pot. Cook for an additional 30 minutes.
Serve hot with rice or your choice of side.