Keep Frozen. Run bags under cool water to separate them. Do not force bags apart. Place frozen bags into the boiling water. Once the water has returned to a boil, reduce heat and simmer. Hold bags at 200F for 15-20 minutes to thaw and heat thoroughly. Stirring to separate the bags during the heating process should be done with a smooth edged plastic or wooden spoon. Sharp objects and metal tongs may puncture the bag. Carefully remove the bag from the hot water, trying not to puncture the bags.