Preheat oven for 30 minutes at 190 degrees. Cooking time: Med Rare – 30 minutes, Medium – 35 minutes, Medium well – 40 minutes. Resting time: Rest for 10 minutes. Turn the Beef Wellington over and cook for a further 15 minutes. Slice in half and serve. For the Jus, place a large pot of water on the stove and bring to a simmer, turn heat to low. Place vacuum-packed red wine jus into the pot of water, and heat through for 5 minutes. Carefully remove the bag, cut a small corner of the bag and pour.