Trim any excess fat off of the oxtails. You'll still want to leave a bit of fat on.
In a bowl, seaon the oxtail with vinegar, salt, ground black pepper and granulated garlic.
Heat enough olive oil in a pressure cooker and add the oxtails.
Saute the oxtail over medium high heat for 3-5 minutes on each side or until browned.
Add enough beef broth to the pressure cooker to cover the oxtails. It took me about 5 cups but this can vary depending on how large or small your pot is.
Lower the heat to medium and place the pressure lid on the pot, ensuring it is locked in.
Once the oxtails come to pressure, cook for 45 minutes. You'll want to begin cooking the rice as the oxtails are pressure cooking (unless you're using leftover rice for this recipe).
Allow the pressure to naturally release and manually release any remaining pressure before opening the lid.
Remove the oxtails form the pan, and use a fork to shred the meat. Discard the bones and set aside as you make the rest of the recipe.