the present invention is directed to packages having a flexible top sheet sealed to a flexible embossed bottom sheet the flexible bottom sheet comprises a plurality of embossed peaks and valleys wherein each valley has a defined perimeter with a valley base integrally connected to a valley wall which thereby defines an individual liquid containment cell . the packages according to the present invention are heat resistant to allow food packaged therein to be cooked in a microwave oven such that a substantial amount of water and / or grease released by the food during the cooking process is captured beneath a food contact surface in a plurality of embossed individual liquid containment cells , in preferred embodiments , the package of the present invention is a microwavable form - fill - seal package or microwavable vacuum package for storing and cooking a precooked or cured food product with substantial water and / or fat content .