Get your oven heating to 355°F — you'll need steady, moderate heat for the long braise ahead.
Warm the oil in a heavy, oven-safe Dutch oven over high heat until it shimmers. You want serious heat here for proper browning.
Sear the oxtail pieces in batches, turning them to brown deeply on all surfaces. Don't crowd the pot — good browning means better flavor. Transfer the browned pieces to a plate.
Drop the heat to medium and add the onions to the same pot. Let them soak up all those browned bits as they cook until softened and translucent.
⏱ 3 min
Toss in the garlic, carrots, and celery. Keep stirring and cooking until the vegetables start to soften and smell fragrant — you're building the flavor foundation.
⏱ 5 min
Add the chopped tomatoes and let them break down into a chunky, jammy sauce. The natural sugars will concentrate and deepen the flavor.
⏱ 5 min
Nestle the browned oxtail back into the pot, stirring gently to coat everything with the tomato mixture.
Crank the heat back up to high and pour in the red wine. Let it bubble vigorously to cook off some alcohol and concentrate the flavors.
⏱ 3 min
Add the sherry and bay leaves, giving everything another brief, bubbling cook. The alcohol should smell less sharp now.
⏱ 2 min
Pour in just enough water to barely cover the ingredients — too much liquid dilutes the flavor. Bring everything to a strong bubble.
Cover tightly with the lid and slide the pot into your preheated oven. The gentle, even heat will work magic on that tough oxtail.
⏱ 1 hr 30 min
Check on the liquid level every hour — if it looks low, add a splash more water. The oxtail should stay mostly submerged.
After 90 minutes, reduce the oven to 320°F and stir in the chopped parsley. Continue cooking for another hour and a half until the meat is falling-apart tender.
⏱ 1 hr 30 min
Carefully lift out all the oxtail pieces and any loose meat that's fallen off the bone. Set them aside in a serving bowl.
Pour everything left in the pot through a fine-mesh strainer into a large bowl. Press the vegetables firmly to extract every drop of flavor, then discard the solids.
Return the oxtail to the strained sauce and warm gently over low heat, stirring carefully to avoid breaking up the meat.
Serve immediately while steaming hot, ideally alongside crispy potato wedges that can soak up every bit of that rich, wine-dark sauce.