Oxtail with Orange, Olives and Walnuts Recipe

Name: Oxtail with Orange, Olives and Walnuts Recipe
Prep time: 30 min
Cook time: 3 h
Yield: 6
Ingredients: 1 large brown onion, roughly chopped; 1 celery stick, roughly chopped; 1/4 cup (60ml) Maggie Beer Extra Virgin Olive Oil; 70g shelled walnuts; 2.0kg oxtail trimmed and cut into 5 cm pieces; For dusting plain flour; Sea salt and freshly cracked black pepper, to season; 50g unsalted butter chopped; 1 cup (250ml) cup red wine; 2 cloves garlic, finely chopped; 1 sprig thyme; 1 bay leaves; 1/4 cup flat leaf parsley; 1 cup (250g) Maggie Beer Premium Australian Passata; 2 cups (500ml) Maggie Beer Beef Stock; 2 cups (500ml) water; 2 strips orange rind; 20 Maggie Beer Kalamata Olives, pitted; 1/4 cup (60ml) Maggie Beer Aged Red Wine Vinegar; 2 1/2 tbspn caster sugar