Prepare the Oxtail: Place the oxtail into a pressure cooker along with the quartered onion, garlic, cloves, 1 tablespoon of salt, and cinnamon powder. Cover with water, secure the lid, and cook on high until it reaches pressure. Then reduce the heat to medium and cook under high pressure for 40 minutes.
Prepare the Flour Mixture: Mix together the flour, 1 tablespoon of salt, garlic powder, and ground coriander in a bowl.
Cook the Vegetables: After releasing the pressure from the cooker, remove the oxtail and place it on a rack to dry slightly. Bring the stock back to a simmer and reduce by 1/4. Add capsicum, snow peas, cherry tomatoes, and sliced onions, and simmer for 5 minutes.
Fry the Oxtail: Dust the oxtail in the flour mixture, shaking off any excess. Fry in tallow at 350°F (180°C) for 4-5 minutes or until crispy and golden brown.
Serve: Serve the soup alongside a pile of the fried oxtail.