01 -
Preheat oven to 300 F. Pat oxtail pieces dry with paper towels.
02 -
Heat oil in Dutch oven over high heat. Sear oxtails until brown on all sides. Remove and set aside.
03 -
Lower heat to medium. Sauté onions and garlic for 5 minutes until onions are translucent.
04 -
Add wine and scrape browned bits from bottom of pan. Return oxtails to pot.
05 -
Add stock, tomato paste, bay leaves, peppercorns, rosemary, salt, and pepper. Bring to boil.
06 -
Cover pot and transfer to oven. Cook for 3 hours.
07 -
Strain 2 cups braising liquid. Make roux with butter and flour, then whisk in hot strained liquid. Simmer 15 minutes until thickened.
08 -
Strain sauce, season to taste. Serve oxtails with generous portion of sauce.