Rinse the oxtail in water, drain and pat dry using kitchen towels. Season with 1 tsp fine sea salt tsp salt and 1/2 tsp coarsely ground black pepper.
Bring a large Dutch oven to a medium heat. Once warm, add the oil and the seasoned oxtail. Brown the oxtail for 10-15 minutes, ensuring you brown each side thoroughly before turning. Set aside. Note: It's better to brown in batches than overcrowding the pot. You want to render most of the oxtail fat. Remove any excess fat before moving on to the next step - the rendered fat can be refrigerated and used in future recipes :)
Add the diced onions and caramelize for 10 minutes on a medium heat. Once golden, add the mashed garlic confit or regular garlic, tomato paste, thyme, sugar, smoked paprika, white pepper and salt. Sauté for 2 minutes.
Add the passata, refill with water and add to the passata, followed by red wine vinegar. Stir and add the browned oxtail and its juices. Cover and allow to simmer on a low-medium heat for for 3 1/2 - 4 hours, stirring occasionally. Simmer until the meat falls of the bone. Remove the lid during the last hour of cooking to reduce the sauce, if needed. Note: About 2 hours in you can add your vegetables of choice to the stew. Simmer - remember low and slow is your friend. Top up with a dash of water if the sauce is reducing too quickly (see recipe video).
Meanwhile start preparing your starch of choice. Polenta takes around 30 minutes. In a medium saucepan, bring water, milk, salt and 1 tbsp butter to a boil. Gradually add polenta while whisking. Reduce the heat to a low simmer, cover and cook for 25-35 minutes, stirring occasionally to prevent it from sticking to the bottom of the pan. Once it's thick and fluffy, remove from the heat and add in the remaining butter, grated parmesan and cream. Salt to taste and keep warm if the stew still needs to go a bit. Note: Add a dash of stock, water, or milk to loosen up the polenta seeing it continues to thicken as it cools down.
Salt the stew to your taste, dish up, garnish with freshly chopped parsley and dig in! Note: removes excess oil by dipping a paper towel in the oil, it soaks it right up!