Tomato slices ready to be dried in a food dehydrator. In this model, multiple trays can be stacked on top of each other and warm air flows around the food. A food dehydrator is a device that removes moisture from food to aid in its preservation. Food drying is a way to preserve fruit, vegetables, and animal proteins after. We just published detailed instructions on how to build your own solar dehydrator—based on a time-tested design from Minnesota. 1 c Flax seed 1 c Water 1 heaping Tbsp Date Paste 4 cups Pumpkin Seeds 4 cups chopped Pumpkin. 1 c Flax seed 1 c Water 1 heaping Tbsp Date Paste 4 cups Pumpkin Seeds 4 cups chopped Pumpkin. Why dry? Drying (dehydrating) food is one of the oldest and easiest methods of food preservation. Many fruits and vegetables can be dried (Table 1). Pineapples, Peppers (red, green, and chili). Plums, Potatoes. Pumpkin. This dried pumpkin fruit leather is an easy to make snack. This recipe is adapted from Mary Bell's Dehydrator cookbook, which is my “go to” book for all things Stack sheets of fruit or vegetable leathers on top of each other.