Natures Oven by Reco No.140 Offers a simple, efficient way to cook foods in their natural juices Unglazed clay interior and exterior allows for absorption of water prior to roasting A tight-fitting cover circulates heat while sealing in juices, flavor and nutrients. Moisture in the unglazed bottom, allows cooking without any additives like water, fats, oils or other liquids Ideal cooking method for dieters