- Begin by preheating your oven to 350°F/180°C. 
- Heat a large oven-proof skillet or dutch oven over medium-high heat. Add cooking fat and season the meat with salt and pepper. - 3 tablespoon Cooking fat, Sea salt and freshly ground black pepper to taste, 2 lb beef brisket 
- Brown the meat for around 4 minutes per side. Once browned, set the brisket aside. 
- Lower the heat to medium and add more cooking fat if needed. Cook onions and celery until browned for about 10 minutes, stirring frequently. - 2 onions, 4 celery stalks 
- Add garlic, parsley, apple cider vinegar, tomatoes, and stock to the skillet and bring it to a boil. - 4 garlic cloves, ¼ cup apple cider vinegar, 1 tablespoon dried parsley, 28 oz diced tomatoes, 2 cups beef stock 
- Return the brisket to the skillet and put it in the oven, covered, for around 2 ½ hours until the meat is fork-tender. 
- Afterward, let the meat rest for 30 minutes before serving.