Fully defrost the bacon before cooking. To do this pop the pouch of bacon (still in its packaging) into a bowl of cool water and leave to thaw for around 5-10 minutes.
Add the bacon to a cold cast iron pan. Place on a medium heat and allow the pan to heat up and the fat to gently render.
For very crispy bacon add the bacon to a baking tray and place into a fan assisted preheated oven set to 190C and cook for approximately 7-10 minutes.