onion powder recipe | garlic powder recipe | ginger powder recipe with detailed photo and video recipe. a basic and helpful dehydrated spice powder mix made by sun-drying the onion, garlic and ginger. these are helpful spice mix powders to be in any kitchen as it can be an ideal replacement for the fresh ones and can be preserved for a longer time. generally, these are prepared by sun-drying the fresh vegetables or spices, but can also be prepared using a dehydrator or in an oven.