Methods and systems for processing foods includes providing a flexible package. A pre-processed food product (e.g., raw food) is provided and is processed by rapidly heating the food product. This processed food product is delivered into the flexible package for consumption by a user. Additionally, in other embodiments, methods and systems for processing frozen food products to shelf stable or refrigerated products are provided. A frozen food product is provided, converted to a pumpable state, and then processed by rapidly heating the food product. This processed food product is then delivered into a package.