Trim fat from oxtails. Rinse and pat dry. Set aside. Heat oil in cooking pot Cover oxtails with salt and pepper, brown on all sides. Chop onions, add to oxtail, and cook until onions are soft.
Add red cooking wine and 1 cup beef stock. Bring to boil, then reduce to simmer, covered for 1.5 hours.
Lift lid and sprinkle in your rice. Add 2 remaining cups of beef broth. Add garlic. Cook on low for about 1 more hour or until oxtails are tender and rice is cooked.