1. Combine the diced peppers, celery, carrots, and white onion in a bowl. Set them aside.
2. In a small bowl, add the season salt, pepper, garlic powder, onion powder, smoked paprika, cayenne pepper, and brown sugar. Mix together well with a fork and set aside.
3. Wash your oxtails as proposed in the tip above. Soak it in water and vinegar for 20 minutes or so and then pat it dry with some paper towel. Place your oxtails in another bowl, then add 1 tbsp of Worcestershire sauce, 1 tbsp of soy sauce, 2 tsp browning sauce, and your homemade seasoning rub. Mix everything with the oxtails until they are completely coated in the seasoning. Set the oxtails aside.
4. In your pressure cooker, add the oil and set to saute at the highest temperature. Add your oxtails into the cooker and sear them on each side for a minute. Remember not to overcrowd the pot, and cook in batches instead if necessary.
5. Once you’re done searing the oxtails, take them out and set them aside. Add 2 tbsp of butter into the pressure cooker and use the butter to deglaze the bottom of the pan. Once the butter starts to melt and you’ve deglazed the pan, set the heat to normal.
6. Add your mixed vegetables into the pan and saute for 5 minutes. Add some minced garlic and saute with the veggies for a minute. Add in 2 cups beef broth, ketchup, red wine, about 3 bay leaves, sprigs of thyme and rosemary, and your diced tomato and green onions. Mix together until it’s well combined.
7. Add your meat into the mix and close the lid of the pressure cooker. Click on the meat/chicken button (cause that cooks oxtails best) and set it to cook for 45 minutes. After 45 minutes, open the vent in the pressure cooker to let off some of its steam so you don’t burn yourself.
8. Remove some of the melted fat from the too with a spoon. Then remove your details and set them on a plate. Pull out the bay leaves, thyme, and rosemary springs and discard them. Add a mix of cornstarch and a little bit of water to the gravy to make it thicker. Set your pressure cooker back to saute and cook the gravy at normal temperature. Stir consistently.
9. You can taste the gravy to check if it needs any more seasoning. Next, add the oxtails back into the pressure cooker and cook for a few more minutes. After the oxtails have mixed well with the gravy, turn off the pressure cooker.
10. Your delicious oxtails are ready to be eaten. You can serve it along with some rice and salads. Enjoy!

If you’re interested in more tips for cooking oxtails in a pressure cooker, ensure you watch this video.