In a large pot, heat the oil and brown the oxtail in batches until well browned on all sides. Remove from pan and pour off any excess oil. Fry the onion and green pepper until soft. Return the oxtail to the pan.
Add the Rajah Mild & Spicy Curry Powder and Robertsons Steak & Chop Spice and fry for 1 minute.
Add Knorrox Oxtail Stock Cubes, water and tomato, stir well and bring to the boil.
Turn the heat down and allow simmering with the lid on for 60 minutes, stirring occasionally. Add the carrots and potatoes. Simmer for another 30 minutes.
Add the Knorrox Oxtail Soup with a little water to form a smooth paste and stir into the sishebo. Add the beans and allow to simmer for 15 minutes to thicken.