Notes
Marshmallows are a mixture of sugar,air,and gelatin.
The sugar makes them sweet, the air makes them fluffy and the gelatin is a protein that holds everything together. By volume, marshmallows are mostly air. When subjected to vacuum,the air from around the marshmallow to push outward,expanding it. Eventually the vacuum is strong enough to pull air from inside the marshmallow,causing it to shrink. When the air in the jar returns to normal atmospheric pressure, you end up with a"mallow grape" because the air has been removed from inside the marshmallow.
This same principle is used in the meat and poultry industry to marinate chicken and other pre-marinated meats.Vacuum meat tumblers marinate meat in a very shot time. Under vacuum,the foods' fibers stretch,becoming more porous. This allows the marinade to penetrate evenly throughout the product. Vacuum tumbling allows meat to absorb up to about 20 percent of its starting weight in marunade without extended preparation. There is an increased yield in the raw product,which means increased yield after cooking and a product that is juicy and tasty.