Mix oxtail, water, broth, onion, garlic, onion salt, salt, and pepper together in a large Dutch oven. Bring to a boil. Cover, turn heat down to a simmer, and cook until meat falls from the bone, about 2 1/2 hours. Stir potatoes, carrots, mushrooms, bell pepper, and green onions into the pot.
This recipe for oxtail stew makes use of the sauté and pressure cooker functions to transform a tough, but nutrient dense, cut of grassfed beef into a hearty bowl of unctuous meat and perfectly soft vegetables and aromatics in a broth that is delicious any time but will be especially nice as the weather shifts to cool fall temperatures.
Transfer the oxtail into a baking dish. Peel and halve a large red onion, juice the orange, peel the carrot and halve the garlic head. Place all the spices in a pot, bring to boil and cook for about 5 minutes. When done, take from the heat and set aside. Place all the ingredients from the pot on top of the browned oxtail.
It's a great source of protein, fat and rich in gelatin. Any slow-cooked meat is great for a low-carb diet. Once you cook it, you can keep it in the fridge and use in salads, with omelets or with your favourite vegetables. Leftover slow-cooked oxtail goes great with omelets or vegetables such as sweet peppers.