In a large bowl, season the oxtails with salt, black pepper, paprika, allspice, onion powder, garlic and ginger paste, dried thyme leaves, soy sauce, and Worcestershire sauce. Thoroughly rub the seasoning into the oxtails.
Cut the fresh herbs and spices (onion, garlic, ginger, thyme, tomato, scotch bonnet pepper, bell pepper, and green onion) then divide them into half.
Add half the portion of the fresh herbs and spices to the oxtails and rub in well, and set aside the remaining half until later on in the cooking process.
Cover the seasoned oxtails and let it marinate for 6 - 8 hours or move immediately to the cooking method of choice.
Preheat the oven to 350°F (175°C)
In a dutch oven or large skillet, heat the cooking oil on medium heat. Add the brown sugar, stirring quickly and thoroughly for about 1 minute or until the sugar melts and turns dark brown.
Immediately add the seasoned oxtail and allow each side of the meat to brown for 3-4 minutes
Using the same bowl used to season the oxtail, add 1 cup water and mix well. When both sides of oxtail have browned, add the water from the bowl, stir the pot then cover it and let the meat cook for 10 - 15 minutes
Add the left over herbs and spices, knorr powder, ketchup and enough beef broth to cover the meat.
Stir the pot then cover it. Put dutch oven in the oven and let the oxtail cook in the for about 2 ½ to 3 hours or until the oxtail is tender and the meat falls off the bone, adding more water if necessary
Shred the oxtail meat, discarding bones, and set aside to cool.