Then add the vegetable, and cook 3 or 4 minutes. Some of the vitamin value of vegetables is lost in canning, but there is little loss of minerals. To retain vitamins and flavor, do not open canned vegetables until you are ready to use them. Preparing Dehydrated Vegetables. To prepare dehydrated vegetables, add water and cook according to the directions on the package.
Dehydrated vegetables are fresh vegetables that have been cleaned, trimmed, and cut into pieces.
The water is removed from the vegetables before they are packaged. There is no waste in dehydrated vegetables, and most of them are inexpensive and easy to use.