Blanch oxtail in boiling water for 5 minutes. Drain and rinse under cold water to remove impurities.
Heat oil in a large clay pot or Dutch oven over medium-high heat. Working in batches, brown the oxtail on all sides until golden (about 3-4 minutes per batch). Remove and set aside.
In the same pot, sauté garlic, onions, and celery until softened (about 3 minutes).
Stir in tomato paste and cook for 1 minute until fragrant.
Pour in the red wine, scraping the bottom of the pot to deglaze. Simmer for 2 minutes to reduce slightly.
Return the browned oxtail to the pot. Add beef stock, soy sauce, brown sugar, thyme, rosemary, bay leaf, and peppercorns. Bring to a boil.
Cover the pot and reduce heat to low. Braise for 90 minutes until oxtail is very tender. Stir occasionally.
Add carrots and potatoes. Season with salt and black pepper. Cover and continue braising for another 40 minutes until vegetables are tender.
Remove herb sprigs and bay leaf. Taste and adjust seasoning if needed. The sauce should be rich, glossy, and coat the back of a spoon.
Serve hot directly in the clay pot, ladling the meat, vegetables, and sauce into bowls.
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