How Freeze Dried Food Stays Fresh for Months: The Science Explained You open a packet of Dal Makhani that was made six months ago, add hot water, and in minutes it tastes like it came straight off the stove. No freezer involved. No preservatives you can't pronounce. How does that even work? https://mytastemymealstore.com/blogs/news/freeze-dried-food-how-it-stays-fresh-for-months