Begin with preparing the octopus. Place the octopus in a cryovac bag. Season with salt and pepper. Add 80ml (⅓ cup) lemon oil and tightly seal the bag. Bring a large saucepan of water over medium heat to 85°C on a cook’s thermometer. Add the bag to the water. Cook for 2½ hours. Drain the octopus. Cut off the head and discard. Cut the tentacles into quarters through the m