Freeze Drying Dragon Fruit 😳 What should I freeze dry next? If you’re new to freeze drying, here’s how a freeze dryer works: A freeze dryer works by first freezing the food. Then, it creates a vacuum that allows the frozen water in the food to sublimate—turning directly from ice into vapor without becoming liquid. Then, the vapor is removed. This preserves the food to last a long time without going bad and it makes the food crispy. | Vegan A Bit Of All