1Heat the olive oil in a large pot over medium-high heat.
Season the oxtail with salt and pepper, then brown them in the pot on all sides. Remove and set aside.
In the same pot, add the chopped onion, sliced carrots, and sliced celery. Cook until the vegetables are softened, about 5-7 minutes.
Add the minced garlic and cook for another minute.
Stir in the tomato paste, smoked paprika, and thyme. Cook for another 2 minutes.
Pour in the red wine, scraping up any browned bits from the bottom of the pot. Let it simmer for about 5 minutes.
Return the oxtail to the pot and add the beef broth and bay leaf. Bring to a boil.
Reduce the heat to low, cover, and let it simmer for about 3 hours, or until the oxtail is tender and the meat is falling off the bone.
Remove the bay leaf and adjust the seasoning with salt and pepper to taste.
Serve hot and enjoy your Spanish Oxtail Stew.