Oven drying leeks and using them to make homemade leek powder is a great way to use up leftovers and dip your toes into dehydrating food. Last summer I started to wonder about dehydrating foods and how to use up vegetables that often sat unused in my refrigerator, like a bunch of celery or the green tops of leeks that generally get tossed in favor of using the thicker white stalks. So I began to research dehydrating food and what the best dehydrators were. Aaaaand promptly had a heart attack because of how expensive they were. It seemed a little…